Radiation sensitive composition

ABSTRACT

A compound of Formula (5-1) or Formula (5-3):where R17 and R21 are each an ethyl group; R22 and R23 are each a methyl group; and R16 and R20 are each a methoxy group.

TECHNICAL FIELD

The present invention relates to a radiation sensitive polysiloxane anda radiation sensitive composition including the radiation sensitivepolysiloxane, a pattern formation method using the radiation sensitivecomposition, and a method for producing a semiconductor device.

BACKGROUND ART

In the field of microfabrication for producing integrated circuitelements, the development of lithography techniques using a radiationhaving a shorter wavelength has been pursued to increase the degree ofintegration.

Examples of such a shorter wavelength radiation include a bright linespectrum of a mercury-vapor lamp, far-ultraviolet rays such as excimerlasers, X-rays, and electron beams. Among these radiations, a KrFexcimer laser (with a wavelength of 248 nm), an ArF excimer laser (witha wavelength of 193 nm), and EUV (with a wavelength of 13.5 nm) havebeen attracting attention.

Furthermore, also in the field of display and the field of micromachinessuch as acceleration sensors, the development of a high aspectpatterning technique as well as size reduction and higher definition hasbeen desired.

As the high aspect patterning technique, for example, a double-layerresist process is known. In the double-layer resist process, it isnecessary to pattern an upper layer resist by exposure and developmentand transfer the pattern to a lower layer resist.

To transfer the pattern of an upper layer resist to a lower layer resistwith high precision, dry etching is usually used, and accordingly, theupper layer resist is required not only to be highly sensitive and be ofhigh resolution, but also to be highly resistant to dry etching.

As a siloxane-containing negative resist material, a system formed bymaking use of a crosslinking reaction of silanol and a system formed bymaking use of a crosslinking reaction of an organic functional group areknown. Examples of the siloxane-containing negative resist materialinclude: a composition containing a resin component and a component (aphotoacid generator or a photobase generator) that generates an acid ora base when irradiated with radiation, and formed by making use of achemical reaction of them; and a composition containing a component (aphotopolymerization initiator) that generates a radical when irradiatedwith radiation and a resin component, and formed by making use of aradical polymerization reaction.

For example, Patent Literature 1 discloses a negative radiationsensitive composition including a siloxane resin and a photoacid orphotobase generator contained in the resin.

As a negative resist formed by making use of a chemical reaction of anorganic functional group, Patent Literature 2 discloses a negativeradiation sensitive composition including a silane containing an epoxygroup as a siloxane resist for a double layer resist.

Patent Literature 3 discloses a negative radiation sensitive compositionincluding a silane containing an acrylic or methacrylic group.

Patent Literature 4 discloses a negative radiation sensitive compositionincluding a silane containing a styryl group using a photopolymerizationinitiator. A negative radiation sensitive composition according to thepresent invention is of a phenoplast crosslinking type, and differs fromthe crosslinking type of the above-mentioned compositions.

Many siloxane-based resists including a phenolic hydroxy group as adeveloping-solution-soluble group are known, but any of them has beenused as a positive resist. For example, Patent Literature 5 discloses apositive radiation sensitive composition including hydroxyphenyl alkylsilsesquioxane as a component, in which a photoacid generator and aphenolic or carboxylic acid compound protected with an acid-decomposablegroup are contained.

Patent Literature 6 discloses a positive radiation sensitive compositionincluding a photoacid generator and a siloxane polymer in which aphenolic hydroxy group is protected with an unstable acid group, such ast-butoxycarbonyl group, t-butoxycarbonylmethyl group, trimethylsilylgroup, or tetrahydropyranyl group.

In Patent Literature 7, pattern formation is performed by irradiation ofelectron beams or EUV, using a polyphenol compound having two or morephenolic hydroxy groups in one molecule and a phenoplast crosslinkingagent containing methylol or protected methylol.

PRIOR ART DOCUMENTS Patent Documents

-   Patent Document 1: Japanese Patent No. 3821165-   Patent Document 2: Japanese Unexamined Patent Application    Publication No. 2003-295455 (JP 2003-295455 A)-   Patent Document 3: Japanese Unexamined Patent Application    Publication No. 2008-248239 (JP 2008-248239 A)-   Patent Document 4: Japanese Unexamined Patent Application    Publication No. 10-10741 (JP 10-10741 A)-   Patent Document 5: Japanese Patent No. 4361527-   Patent Document 6: Japanese Unexamined Patent Application    Publication No. 08-160621 (JP 08-160621 A)-   Patent Document 7: Japanese Unexamined Patent Application    Publication No. 2010-107963 (JP 2010-107963 A)

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

A conventional radiation sensitive composition including polysiloxane asa base resin provides a lower resolution than a conventional radiationsensitive composition including an acrylic-based resin as a base resin,and hence, the precision of a pattern obtained is insufficient when anexcimer laser such as KrF laser is used as exposure light, andtherefore, further improvement of the composition has been desired.

The present invention is to solve the above-mentioned problem, and anobject of the present invention is to provide a radiation sensitivecomposition including polysiloxane as a base resin, the compositionbeing excellent in resolution and allowing a pattern having a desiredshape to be formed with sufficient precision.

Means for Solving the Problem

The inventors found that a radiation sensitive composition including asiloxane polymer having phenoplast crosslinking reactivity as a baseresin and further including a photoacid generator and a solvent allowsresolution to be increased, and the inventors then completed the presentinvention.

The present invention provides, as a first aspect, a radiation sensitivecomposition comprising: as a silane, a hydrolyzable silane, a hydrolysisproduct thereof, or a hydrolysis-condensation product thereof; and aphotoacid generator, in which the hydrolyzable silane includeshydrolyzable silanes of Formula (1) and Formula (2),

R¹ _(a)R² _(b)Si(R³)_(4-(a+b))

[wherein R¹ is an organic group of Formula (1-2):

(wherein R⁴ is a hydrogen atom, a C₁₋₁₀ alkyl group, or an acyl group;R⁵ is a hydrogen atom, a C₁₋₁₀ alkyl group, or a C₁₋₁₀ alkyl grouphaving a C₁₋₁₀ alkoxy group; R⁶ is a C₁₋₁₀ alkyl group; n1 is an integerof 0 to 10; n2 is an integer of 0 or 1; n3 is an integer satisfying1≤n3≤5; n4 is an integer satisfying 0≤n4≤4; n5 is an integer satisfying0≤n5≤4; n3+n4+n5 is an integer satisfying 1≤n3+n4+n5≤5; k1 is an endbonded to a silicon atom when n1 is an integer of 1 to 10; k2 is an endbonded to a silicon atom when n1 is 0 and n2 is 1; and k3 is an endbonded to a silicon atom when n1 and n2 are each 0), and is bonded to asilicon atom through a Si—C bond or a Si—O bond; R² is an alkyl group,an aryl group, a halogenated alkyl group, a halogenated aryl group, analkoxy aryl group, an alkenyl group, or an organic group having an epoxygroup, an acryloyl group, a methacryloyl group, a mercapto group, anamino group, or a cyano group, or a combination of these groups, and isbonded to a silicon atom through a Si—C bond; R³ is an alkoxy group, anacyloxy group, or a halogen group; a is an integer of 1; b is an integerof 0 to 2; and a+b is an integer of 1 to 3],

R⁷ _(c)R⁸ _(d)Si(R⁹)_(4-(c+d))

[wherein R⁷ is an organic group of Formula (2-1) or Formula (2-2):

(in Formula (2-1), R¹⁰ is a C₁₋₁₀ alkyl group; R¹¹ is a hydrogen atom, aC₁₋₁₀ alkyl group, or a C₁₋₁₀ alkyl group having a C₁₋₁₀ alkoxy group;n6 is an integer satisfying 0≤n6≤3; n7 is an integer satisfying 1≤n7≤3;n6+n7 is an integer satisfying 1≤n6+n7≤4; n8 is an integer satisfying0≤n8≤10; n9 is an integer of 0 or 1; k4 is an end bonded to a siliconatom when n8 is an integer of 1 to 10; k5 is an end bonded to a siliconatom when n8 is 0 and n9 is 1; and k6 is an end bonded to a silicon atomwhen n8 and n9 are each 0, and

in Formula (2-2), R¹¹² is a hydroxy group, a halogen atom, an epoxygroup, an oxetane group, an acyloxy group, a (meth)acryloyl group, asilyl group, a C₁₋₁₀ alkoxy group, a C₁₋₁₀ alkoxy group having a C₁₋₁₀alkoxy group, or a combination of these groups; R¹¹³ is a C₁₋₁₀ alkylenegroup or a C₆₋₄₀ arylene group, optionally containing an oxygen atom;n10 is an integer of 1 to 4; and k7 is an end bonded to a silicon atom),and is bonded to a silicon atom through a Si—C bond; R⁸ is an alkylgroup, an aryl group, a halogenated alkyl group, a halogenated arylgroup, an alkoxy aryl group, an alkenyl group, or an organic grouphaving an epoxy group, an acryloyl group, a methacryloyl group, amercapto group, an amino group, or a cyano group, or a combination ofthese groups, and is bonded to a silicon atom through a Si—C bond; R⁹ isan alkoxy group, an acyloxy group, or a halogen group; c is an integerof 1; d is an integer of 0 to 2; and c+d is an integer of 1 to 3];

as a second aspect, the radiation sensitive composition according to thefirst aspect, in which the hydrolyzable silane is a combination of thehydrolyzable silane of Formula (1), the hydrolyzable silane of Formula(2), and other hydrolyzable silane, and the other hydrolyzable silane isat least one hydrolyzable silane selected from the group consisting of ahydrolyzable silane of Formula (3):

R¹² _(e)Si(R¹³)_(4-e)  (3)

(wherein R¹² is an alkyl group, an aryl group, a halogenated alkylgroup, a halogenated aryl group, an alkenyl group, or an organic grouphaving a mercapto group, a sulfonamide group, or a cyano group, or acombination of these groups, and is bonded to a silicon atom through aSi—C bond; R¹³ is an alkoxy group, an acyloxy group, or a halogen group;and e is an integer of 0 to 3), and a hydrolyzable silane of Formula(4):

[R¹⁴ _(f)Si(R¹⁵)_(3-f)]₂Y_(g)

(wherein R¹⁴ is an alkyl group or an aryl group, and is bonded to asilicon atom through a Si—C bond; R¹⁵ is an alkoxy group, an acyloxygroup, or a halogen group; Y is an alkylene group, an alkenylene group,or an arylene group; f is an integer of 0 or 1: and g is an integer of 0or 1);

as a third aspect, a radiation sensitive composition comprising, as apolymer, a hydrolysis-condensation product of a hydrolyzable silanecomprising a combination of the hydrolyzable silane of Formula (1) andthe hydrolyzable silane of Formula (2) according to the first aspect andthe hydrolyzable silane of Formula (3) according to the second aspect;

as a fourth aspect, a radiation sensitive composition comprising, as apolymer, a hydrolysis-condensation product of a hydrolyzable silanecomprising a combination of the hydrolyzable silane of Formula (1) andthe hydrolyzable silane of Formula (2) according to the first aspect andthe hydrolyzable silane of Formula (4) according to the second aspect;

as a fifth aspect, a radiation sensitive composition comprising, as apolymer, a hydrolysis-condensation product of a hydrolyzable silanecomprising a combination of the hydrolyzable silane of Formula (1) andthe hydrolyzable silane of Formula (2) according to the first aspect andthe hydrolyzable silane of Formula (3) and the hydrolyzable silane ofFormula (4) according to the second aspect;

as a sixth aspect, the radiation sensitive composition according to anyone of the first to fifth aspects, further comprising a quencher;

as a seventh aspect, the radiation sensitive composition according toany one of the first to sixth aspects, further comprising a crosslinkingagent;

as an eighth aspect, a method for forming a resist pattern, the methodcomprising the steps of: applying the radiation sensitive compositionaccording to any one of the first to seventh aspects onto asemiconductor substrate and baking the composition to form a resistfilm; exposing the resist film to light; and after the exposure,developing the resist film to form a resist pattern;

as a ninth aspect, a method for producing a semiconductor device, themethod comprising the steps of: applying the radiation sensitivecomposition according to any one of the first to seventh aspects onto asemiconductor substrate and baking the composition to form a resistfilm; exposing the resist film to light; after the exposure, developingthe resist film to form a resist pattern; and processing thesemiconductor substrate using the resist pattern;

as a tenth aspect, a method for producing a semiconductor device, themethod comprising the steps of: forming an organic underlayer film on asemiconductor substrate; applying the radiation sensitive compositionaccording to any one of the first to seventh aspects onto the underlayerfilm and baking the composition to form a resist film; exposing theresist film to light; after the exposure, developing the resist film toform a resist pattern; etching the organic underlayer film using theresist pattern; and processing the semiconductor substrate using thepatterned organic underlayer film; and

as an eleventh aspect, a compound of Formula (5-1), Formula (5-2), orFormula

(wherein R¹⁷, R¹⁹, R²¹, R²², and R²³ are each independently an alkylgroup; and R¹⁶, R¹⁸, and R²⁰ are each independently an alkoxy group, anacyloxy group, or a halogen group).

Effects of the Invention

The present invention provides a polysiloxane-based radiation sensitiveresin that is excellent in sensitivity and resolution and includespolysiloxane as its skeleton, and has, in its side chain, a functionalgroup capable of undergoing a phenoplast reaction making use of acrosslinking structure formed by a reaction of a protected methylolgroup and a protected phenolic hydroxy group.

The phenoplast reactive group in the radiation sensitive resin of thepresent invention includes methylol or a protected methylol group, andwhen the reactive group is added to a portion with an abundance ofelectrons of an aromatic ring in the polymer, the resin can be cured atlow temperature, and thus, a negative pattern that is good as a resistfor lithography can be obtained.

The radiation sensitive resin of the present invention is apolysiloxane-based radiation sensitive resin having polysiloxane at itsskeleton, and accordingly, a resist pattern formed by exposure isexcellent in gas etching resistance.

Therefore, the radiation sensitive resin of the present invention isalso applicable to a multi-process in which, for the purpose ofpreventing the collapse of a finer pattern of a resist film at the timeof development, the film thickness of a resist is made thinner, and anunderlayer film having gas etching resistance different from that of theresist material is provided directly under the resist film.

As described above, the present invention provides a radiation sensitivecomposition that has high lithography characteristics and allows apattern having a desired shape to be formed with sufficient precision.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A to 1C illustrate sectional views of resist pattern shapes.

FIG. 2 illustrates a sectional shape of a resist pattern formed inExample 18 observed using a scanning electron microscope.

FIG. 3 illustrates a sectional shape of the resist pattern formed inExample 18 observed using a scanning electron microscope after heated ona hot plate at 230° C. for 30 minutes.

MODES FOR CARRYING OUT THE INVENTION

The present invention provides a radiation sensitive compositioncomprising: as a silane, a hydrolyzable silane, a hydrolysis productthereof, or a hydrolysis-condensation product thereof; and a photoacidgenerator, in which the hydrolyzable silane includes hydrolyzablesilanes of Formula (1) and Formula (2).

In Formula (1), R¹ is an organic group of Formula (1-2) and is bonded toa silicon atom through a Si—C bond or a Si—O bond. R² is an alkyl group,an aryl group, a halogenated alkyl group, a halogenated aryl group, analkoxy aryl group, an alkenyl group, or an organic group having an epoxygroup, an acryloyl group, a methacryloyl group, a mercapto group, anamino group, or a cyano group, or a combination of these groups, and isbonded to a silicon atom through a Si—C bond. R³ is an alkoxy group, anacyloxy group, or a halogen group. a is an integer of 1; b is an integerof 0 to 2; and a+b is an integer of 1 to 3.

In Formula (1-2), R⁴ is a hydrogen atom, a C₁₋₁₀ alkyl group, or an acylgroup; R⁵ is a hydrogen atom, a C₁₋₁₀ alkyl group, or a C₁₋₁₀ alkylgroup having a C₁₋₁₀ alkoxy group; R⁶ is a C₁₋₁₀ alkyl group; n1 is aninteger of 0 to 10; n2 is an integer of 0 or 1; n3 is an integersatisfying 1≤n3≤5; n4 is an integer satisfying 0≤n4≤4; n5 is an integersatisfying 0≤n5≤4. n3+n4+n5 is an integer satisfying 1≤n3+n4+n5≤5,preferably an integer satisfying 1≤n3+n4+n5≤3.

k1, k2, or k3 is an end bonded to a silicon atom. In other words, inFormula (1-2), when n1 is 0 and n2 is 1, the organic group is bonded atk2 to a silicon atom of the silane. When n2 is 0 and n1 is an integerother than 0, the organic group is bonded at k1 to a silicon atom of thesilane. When n2 is 0 and n1 is 0, the organic group is bonded at k3 to asilicon atom of the silane.

In Formula (2), R⁷ is an organic group of Formula (2-1) and is bonded toa silicon atom through a Si—C bond. R⁸ is an alkyl group, an aryl group,a halogenated alkyl group, a halogenated aryl group, an alkoxy arylgroup, an alkenyl group, or an organic group having an epoxy group, anacryloyl group, a methacryloyl group, a mercapto group, an amino group,or a cyano group, or a combination of these groups, and is bonded to asilicon atom through a Si—C bond. R⁹ is an alkoxy group, an acyloxygroup, or a halogen group. c is an integer of 1; d is an integer of 0 to2; and c+d is an integer of 1 to 3.

In Formula (2-1), R¹⁰ is a C₁₋₁₀ alkyl group; is a hydrogen atom, aC₁₋₁₀ alkyl group, or a C₁₋₁₀ alkyl group having a C₁₋₁₀ alkoxy group.n6 is an integer satisfying 0≤n6≤3. n7 is an integer satisfying 1≤n7≤3.n6+n7 is an integer satisfying 1≤n6+n7≤4, preferably an integersatisfying 1≤n6+n7≤3. n8 is an integer satisfying 0≤n8≤10. n9 is aninteger of 0 or 1. k4, k5, or k6 is an end bonded to a silicon atom. Inother words, in Formula (2-1), when n8 is 0 and n9 is 1, the organicgroup is bonded at k5 to a silicon atom of the silane. When n9 is 0 andn8 is an integer other than 0, the organic group is bonded at k4 to asilicon atom of the silane. When n9 is 0 and n8 is 0, the organic groupis bonded at k6 to a silicon atom of the silane.

In Formula (2-2), R¹¹² is a hydroxy group, a halogen atom, an epoxygroup, an oxetane group, an acyloxy group, a (meth)acryloyl group, asilyl group, a C₁₋₁₀ alkoxy group, a C₁₋₁₀ alkoxy group having a C₁₋₁₀alkoxy group, or a combination of these groups; and R¹¹³ is a C₁₋₁₀alkylene group or a C₆₋₄₀ arylene group, optionally containing an oxygenatom. n10 is an integer of 1 to 4; and k7 is an end bonded to a siliconatom.

Examples of the above-mentioned alkoxy group include alkoxy groupslisted later.

Examples of the above-mentioned halogen atom (halogen group) includehalogen atoms (halogen groups) listed later.

The above-mentioned C₁₋₁₀ alkylene group is an alkylene groupcorresponding to a linear or cyclic alkyl group having a carbon atomnumber of 1 to 10 mentioned later, and examples thereof includemethylene group, ethylene group, and propylene group.

The above-mentioned C₆₋₄₀ arylene group is an arylene groupcorresponding to a C₆₋₄₀ aryl group mentioned later, and examplesthereof include phenyl group and naphthyl group.

These are monomers that generate an alcohol through decomposition causedby acid or base and monomers having an alcohol.

The composition of the present invention may include, as optionalcomponents, an acid, water, an alcohol, other organic polymers, alight-absorbing compound, and a surfactant, for example.

The radiation sensitive composition of the present invention has a solidcontent of, for example, 0.1% by mass to 50% by mass, 0.1% by mass to30% by mass, or 0.1% by mass to 25% by mass. The solid content herein isobtained by subtracting a solvent component from all components of theradiation sensitive composition.

The proportion of the hydrolyzable silane, the hydrolysis productthereof, and the hydrolysis-condensation product thereof in the solidsis 20% by mass or more, for example, 50% by mass to 99.9% by mass, 60%by mass to 99.9% by mass, or 70% by mass to 99.9% by mass.

The above-mentioned hydrolyzable silane, the hydrolysis product thereof,and the hydrolysis-condensation product thereof may be used in the formof a mixture thereof. A condensation product obtained by hydrolyzing thehydrolyzable silane and condensing the obtained hydrolysis productthereof may be used. Alternatively, there may be used a mixture obtainedby mixing a hydrolysis-condensation product with a silane compound or apartial-hydrolysis product in which hydrolysis for obtaining thehydrolysis-condensation product has not been perfectly completed. Such acondensation product is a polymer having a polysiloxane structure.

The alkyl group is, for example, a C₁₋₁₀ alkyl group, and examplesthereof include methyl group, ethyl group, n-propyl group, i-propylgroup, cyclopropyl group, n-butyl group, i-butyl group, s-butyl group,t-butyl group, cyclobutyl group, 1-methyl-cyclopropyl group,2-methyl-cyclopropyl group, n-pentyl group, 1-methyl-n-butyl group,2-methyl-n-butyl group, 3-methyl-n-butyl group, 1,1-dimethyl-n-propylgroup, 1,2-dimethyl-n-propyl group, 2,2-dimethyl-n-propyl group,1-ethyl-n-propyl group, cyclopentyl group, 1-methyl-cyclobutyl group,2-methyl-cyclobutyl group, 3-methyl-cyclobutyl group,1,2-dimethyl-cyclopropyl group, 2,3-dimethyl-cyclopropyl group,1-ethyl-cyclopropyl group, 2-ethyl-cyclopropyl group, n-hexyl group,1-methyl-n-pentyl group, 2-methyl-n-pentyl group, 3-methyl-n-pentylgroup, 4-methyl-n-pentyl group, 1,1-dimethyl-n-butyl group,1,2-dimethyl-n-butyl group, 1,3-dimethyl-n-butyl group,2,2-dimethyl-n-butyl group, 2,3-dimethyl-n-butyl group,3,3-dimethyl-n-butyl group, 1-ethyl-n-butyl group, 2-ethyl-n-butylgroup, 1,1,2-trimethyl-n-propyl group, 1,2,2-trimethyl-n-propyl group,1-ethyl-1-methyl-n-propyl group, 1-ethyl-2-methyl-n-propyl group,cyclohexyl group, 1-methyl-cyclopentyl group, 2-methyl-cyclopentylgroup, 3-methyl-cyclopentyl group, 1-ethyl-cyclobutyl group,2-ethyl-cyclobutyl group, 3-ethyl-cyclobutyl group,1,2-dimethyl-cyclobutyl group, 1,3-dimethyl-cyclobutyl group,2,2-dimethyl-cyclobutyl group, 2,3-dimethyl-cyclobutyl group,2,4-dimethyl-cyclobutyl group, 3,3-dimethyl-cyclobutyl group,1-n-propyl-cyclopropyl group, 2-n-propyl-cyclopropyl group,1-i-propyl-cyclopropyl group, 2-i-propyl-cyclopropyl group,1,2,2-trimethyl-cyclopropyl group, 1,2,3-trimethyl-cyclopropyl group,2,2,3-trimethyl-cyclopropyl group, 1-ethyl-2-methyl-cyclopropyl group,2-ethyl-1-methyl-cyclopropyl group, 2-ethyl-2-methyl-cyclopropyl group,and 2-ethyl-3-methyl-cyclopropyl group.

The aryl group is, for example, a C₆₋₄₀ aryl group, and examples thereofinclude phenyl group, o-methylphenyl group, m-methylphenyl group,p-methylphenyl group, o-chlorophenyl group, m-chlorophenyl group,p-chlorophenyl group, o-fluorophenyl group, p-fluorophenyl group,o-methoxyphenyl group, p-methoxyphenyl group, p-nitrophenyl group,p-cyanophenyl group, α-naphthyl group, β-naphthyl group, o-biphenylylgroup, m-biphenylyl group, p-biphenylyl group, 1-anthryl group,2-anthryl group, 9-anthryl group, 1-phenanthryl group, 2-phenanthrylgroup, 3-phenanthryl group, 4-phenanthryl group, and 9-phenanthrylgroup.

The alkenyl group is, for example, a C₂₋₁₀ alkenyl group, and examplesthereof include ethenyl group, 1-propenyl group, 2-propenyl group,1-methyl-1-ethenyl group, 1-butenyl group, 2-butenyl group, 3-butenylgroup, 2-methyl-1-propenyl group, 2-methyl-2-propenyl group,1-ethylethenyl group, 1-methyl-1-propenyl group, 1-methyl-2-propenylgroup, 1-pentenyl group, 2-pentenyl group, 3-pentenyl group, 4-pentenylgroup, 1-n-propylethenyl group, 1-methyl-1-butenyl group,1-methyl-2-butenyl group, 1-methyl-3-butenyl group, 2-ethyl-2-propenylgroup, 2-methyl-1-butenyl group, 2-methyl-2-butenyl group,2-methyl-3-butenyl group, 3-methyl-1-butenyl group, 3-methyl-2-butenylgroup, 3-methyl-3-butenyl group, 1,1-dimethyl-2-propenyl group,1-i-propylethenyl group, 1,2-dimethyl-1-propenyl group,1,2-dimethyl-2-propenyl group, 1-cyclopentenyl group, 2-cyclopentenylgroup, 3-cyclopentenyl group, 1-hexenyl group, 2-hexenyl group,3-hexenyl group, 4-hexenyl group, 5-hexenyl group, 1-methyl-1-pentenylgroup, 1-methyl-2-pentenyl group, 1-methyl-3-pentenyl group,1-methyl-4-pentenyl group, 1-n-butylethenyl group, 2-methyl-1-pentenylgroup, 2-methyl-2-pentenyl group, 2-methyl-3-pentenyl group,2-methyl-4-pentenyl group, 2-n-propyl-2-propenyl group,3-methyl-1-pentenyl group, 3-methyl-2-pentenyl group,3-methyl-3-pentenyl group, 3-methyl-4-pentenyl group, 3-ethyl-3-butenylgroup, 4-methyl-1-pentenyl group, 4-methyl-2-pentenyl group,4-methyl-3-pentenyl group, 4-methyl-4-pentenyl group,1,1-dimethyl-2-butenyl group, 1,1-dimethyl-3-butenyl group,1,2-dimethyl-1-butenyl group, 1,2-dimethyl-2-butenyl group,1,2-dimethyl-3-butenyl group, 1-methyl-2-ethyl-2-propenyl group,1-s-butylethenyl group, 1,3-dimethyl-1-butenyl group,1,3-dimethyl-2-butenyl group, 1,3-dimethyl-3-butenyl group,1-i-butylethenyl group, 2,2-dimethyl-3-butenyl group,2,3-dimethyl-1-butenyl group, 2,3-dimethyl-2-butenyl group,2,3-dimethyl-3-butenyl group, 2-i-propyl-2-propenyl group,3,3-dimethyl-1-butenyl group, 1-ethyl-1-butenyl group, 1-ethyl-2-butenylgroup, 1-ethyl-3-butenyl group, 1-n-propyl-1-propenyl group,1-n-propyl-2-propenyl group, 2-ethyl-1-butenyl group, 2-ethyl-2-butenylgroup, 2-ethyl-3-butenyl group, 1,1,2-trimethyl-2-propenyl group,1-t-butylethenyl group, 1-methyl-1-ethyl-2-propenyl group,1-ethyl-2-methyl-1-propenyl group, 1-ethyl-2-methyl-2-propenyl group,1-i-propyl-1-propenyl group, 1-i-propyl-2-propenyl group,1-methyl-2-cyclopentenyl group, 1-methyl-3-cyclopentenyl group,2-methyl-1-cyclopentenyl group, 2-methyl-2-cyclopentenyl group,2-methyl-3-cyclopentenyl group, 2-methyl-4-cyclopentenyl group,2-methyl-5-cyclopentenyl group, 2-methylene-cyclopentyl group,3-methyl-1-cyclopentenyl group, 3-methyl-2-cyclopentenyl group,3-methyl-3-cyclopentenyl group, 3-methyl-4-cyclopentenyl group,3-methyl-5-cyclopentenyl group, 3-methylene-cyclopentyl group,1-cyclohexenyl group, 2-cyclohexenyl group, and 3-cyclohexenyl group.

The acyl group is, for example, a C₂₋₁₀ acyl group, and examples thereofinclude methylcarbonyl group, ethylcarbonyl group, n-propylcarbonylgroup, i-propylcarbonyl group, cyclopropylcarbonyl group,n-butylcarbonyl group, i-butylcarbonyl group, s-butylcarbonyl group,t-butylcarbonyl group, cyclobutylcarbonyl group,1-methyl-cyclopropylcarbonyl group, 2-methyl-cyclopropylcarbonyl group,n-pentylcarbonyl group, 1-methyl-n-butylcarbonyl group,2-methyl-n-butylcarbonyl group, 3-methyl-n-butylcarbonyl group,1,1-dimethyl-n-propylcarbonyl group, 1,2-dimethyl-n-propylcarbonylgroup, 2,2-dimethyl-n-propylcarbonyl group, 1-ethyl-n-propylcarbonylgroup, cyclopentylcarbonyl group, 1-methyl-cyclobutylcarbonyl group,2-methyl-cyclobutylcarbonyl group, 3-methyl-cyclobutylcarbonyl group,1,2-dimethyl-cyclopropylcarbonyl group, 2,3-dimethyl-cyclopropylcarbonylgroup, 1-ethyl-cyclopropylcarbonyl group, 2-ethyl-cyclopropylcarbonylgroup, n-hexylcarbonyl group, 1-methyl-n-pentylcarbonyl group,2-methyl-n-pentylcarbonyl group, 3-methyl-n-pentylcarbonyl group,4-methyl-n-pentylcarbonyl group, 1,1-dimethyl-n-butylcarbonyl group,1,2-dimethyl-n-butylcarbonyl group, 1,3-dimethyl-n-butylcarbonyl group,2,2-dimethyl-n-butylcarbonyl group, 2,3-dimethyl-n-butylcarbonyl group,3,3-dimethyl-n-butylcarbonyl group, 1-ethyl-n-butylcarbonyl group,2-ethyl-n-butylcarbonyl group, and 1,1,2-trimethyl-n-propylcarbonylgroup.

Examples of the organic group having an epoxy group includeglycidoxymethyl group, glycidoxyethyl group, glycidoxypropyl group,glycidoxybutyl group, and epoxycyclohexyl group.

Examples of the organic group having an acryloyl group includeacryloylmethyl group, acryloylethyl group, and acryloylpropyl group.

Examples of the organic group having a methacryloyl group includemethacryloylmethyl group, methacryloylethyl group, andmethacryloylpropyl group.

Examples of the organic group having a mercapto group includeethylmercapto group, butylmercapto group, hexylmercapto group, andoctylmercapto group.

Examples of the organic group having an amino group include amino group,aminomethyl group, and aminoethyl group.

Examples of the organic group having a cyano group include cyanoethylgroup and cyanopropyl group.

The above-mentioned alkoxy group is, for example, a C₁₋₂₀ or C₁₋₁₀alkoxy group, and examples thereof include an alkoxy group having alinear, branched, or cyclic alkyl moiety having a carbon atom number of1 to 20. Examples of such an alkoxy group include methoxy group, ethoxygroup, n-propoxy group, i-propoxy group, n-butoxy group, i-butoxy group,s-butoxy group, t-butoxy group, n-pentyloxy group, 1-methyl-n-butoxygroup, 2-methyl-n-butoxy group, 3-methyl-n-butoxy group,1,1-dimethyl-n-propoxy group, 1,2-dimethyl-n-propoxy group,2,2-dimethyl-n-propoxy group, 1-ethyl-n-propoxy group, n-hexyloxy group,1-methyl-n-pentyloxy group, 2-methyl-n-pentyloxy group,3-methyl-n-pentyloxy group, 4-methyl-n-pentyloxy group,1,1-dimethyl-n-butoxy group, 1,2-dimethyl-n-butoxy group,1,3-dimethyl-n-butoxy group, 2,2-dimethyl-n-butoxy group,2,3-dimethyl-n-butoxy group, 3,3-dimethyl-n-butoxy group,1-ethyl-n-butoxy group, 2-ethyl-n-butoxy group,1,1,2-trimethyl-n-propoxy group, 1,2,2-trimethyl-n-propoxy group,1-ethyl-1-methyl-n-propoxy group, and 1-ethyl-2-methyl-n-propoxy group.Furthermore, examples of the cyclic alkoxy group include cyclopropoxygroup, cyclobutoxy group, 1-methyl-cyclopropoxy group,2-methyl-cyclopropoxy group, cyclopentyloxy group, 1-methyl-cyclobutoxygroup, 2-methyl-cyclobutoxy group, 3-methyl-cyclobutoxy group,1,2-dimethyl-cyclopropoxy group, 2,3-dimethyl-cyclopropoxy group,1-ethyl-cyclopropoxy group, 2-ethyl-cyclopropoxy group, cyclohexyloxygroup, 1-methyl-cyclopentyloxy group, 2-methyl-cyclopentyloxy group,3-methyl-cyclopentyloxy group, 1-ethyl-cyclobutoxy group,2-ethyl-cyclobutoxy group, 3-ethyl-cyclobutoxy group,1,2-dimethyl-cyclobutoxy group, 1,3-dimethyl-cyclobutoxy group,2,2-dimethyl-cyclobutoxy group, 2,3-dimethyl-cyclobutoxy group,2,4-dimethyl-cyclobutoxy group, 3,3-dimethyl-cyclobutoxy group,1-n-propyl-cyclopropoxy group, 2-n-propyl-cyclopropoxy group,1-i-propyl-cyclopropoxy group, 2-i-propyl-cyclopropoxy group,1,2,2-trimethyl-cyclopropoxy group, 1,2,3-trimethyl-cyclopropoxy group,2,2,3-trimethyl-cyclopropoxy group, 1-ethyl-2-methyl-cyclopropoxy group,2-ethyl-1-methyl-cyclopropoxy group, 2-ethyl-2-methyl-cyclopropoxygroup, and 2-ethyl-3-methyl-cyclopropoxy group.

The above-mentioned acyloxy group is, for example, a C₁₋₂₀, C₁₋₁₀,C₂₋₂₀, or C₂₋₁₀ acyloxy group, and examples thereof includemethylcarbonyloxy group, ethylcarbonyloxy group, n-propylcarbonyloxygroup, i-propylcarbonyloxy group, n-butylcarbonyloxy group,i-butylcarbonyloxy group, s-butylcarbonyloxy group, t-butylcarbonyloxygroup, n-pentylcarbonyloxy group, 1-methyl-n-butylcarbonyloxy group,2-methyl-n-butylcarbonyloxy group, 3-methyl-n-butylcarbonyloxy group,1,1-dimethyl-n-propylcarbonyloxy group, 1,2-dimethyl-n-propylcarbonyloxygroup, 2,2-dimethyl-n-propylcarbonyloxy group,1-ethyl-n-propylcarbonyloxy group, n-hexylcarbonyloxy group,1-methyl-n-pentylcarbonyloxy group, 2-methyl-n-pentylcarbonyloxy group,3-methyl-n-pentylcarbonyloxy group, 4-methyl-n-pentylcarbonyloxy group,1,1-dimethyl-n-butylcarbonyloxy group, 1,2-dimethyl-n-butylcarbonyloxygroup, 1,3-dimethyl-n-butylcarbonyloxy group,2,2-dimethyl-n-butylcarbonyloxy group, 2,3-dimethyl-n-butylcarbonyloxygroup, 3,3-dimethyl-n-butylcarbonyloxy group, 1-ethyl-n-butylcarbonyloxygroup, 2-ethyl-n-butylcarbonyloxy group,1,1,2-trimethyl-n-propylcarbonyloxy group,1,2,2-trimethyl-n-propylcarbonyloxy group,1-ethyl-1-methyl-n-propylcarbonyloxy group,1-ethyl-2-methyl-n-propylcarbonyloxy group, phenylcarbonyloxy group, andtosylcarbonyloxy group.

Examples of the above-mentioned halogen group include fluorine,chlorine, bromine, and iodine atoms.

In the present invention, there may be used a hydrolyzable silanecomprising a combination of the hydrolyzable silane of Formula (1), thehydrolyzable silane of Formula (2), and other hydrolyzable silane.

Examples of the other hydrolyzable silane include at least onehydrolyzable silane selected from the group consisting of thehydrolyzable silane of Formula (3) and the hydrolyzable silane ofFormula (4).

The radiation sensitive composition may include, as a polymer, ahydrolysis-condensation product (polysiloxane) of a hydrolyzable silanecomprising a combination of the hydrolyzable silane of Formula (1), thehydrolyzable silane of Formula (2), and the hydrolyzable silane ofFormula (3).

Alternatively, the radiation sensitive composition may include, as apolymer, a hydrolysis-condensation product (polysiloxane) of ahydrolyzable silane comprising a combination of the hydrolyzable silaneof Formula (1), the hydrolyzable silane of Formula (2), and thehydrolyzable silane of Formula (4).

Alternatively, the radiation sensitive composition may include, as apolymer, a hydrolysis-condensation product (polysiloxane) of ahydrolyzable silane comprising a combination of the hydrolyzable silaneof Formula (1), the hydrolyzable silane of Formula (2), the hydrolyzablesilane of Formula (3), and the hydrolyzable silane of Formula (4).

In Formula (3), R¹² is an alkyl group, an aryl group, a halogenatedalkyl group, a halogenated aryl group, an alkenyl group, or an organicgroup having a mercapto group, a sulfonamide group, or a cyano group, ora combination of these groups, and is bonded to a silicon atom through aSi—C bond; R¹³ is an alkoxy group, an acyloxy group, or a halogen group;and e is an integer of 0 to 3.

In Formula (4), R¹⁴ is an alkyl group or an aryl group, and is bonded toa silicon atom through a Si—C bond; R¹⁵ is an alkoxy group, an acyloxygroup, or a halogen group; Y is an alkylene group, an alkenylene group,or an arylene group; f is an integer of 0 or 1; and g is an integer of 0or 1.

The above-mentioned alkylene group is a divalent organic group derivedfrom an alkyl group. The above-mentioned alkenylene group is a divalentorganic group derived from an alkenyl group. The above-mentioned arylenegroup is a divalent organic group derived from an aryl group.

Examples of the alkyl group, the aryl group, the halogenated alkylgroup, the halogenated aryl group, the alkoxyaryl group, the alkenylgroup, or the organic group having an epoxy group, an acryloyl group, amethacryloyl group, a mercapto group, an amino group, or a cyano group,the alkoxy group, the acyloxy group, the halogen group, the alkylenegroup, the alkenylene group, and the arylene group include theabove-mentioned examples.

Examples of the hydrolyzable silane of Formula (1) are as follows.

In the above-mentioned formulae, T is a hydrolyzable group, namely, theabove-mentioned alkoxy group, acyloxy group, or halogen group. Inparticular, the alkoxy group, such as methoxy group or ethoxy group, ispreferable.

Examples of the hydrolyzable silane of Formula (2) wherein R⁷ is anorganic group of Formula (2-1) are as follows.

In the above-mentioned formulae, T is a hydrolyzable group, namely, theabove-mentioned alkoxy group, acyloxy group, or halogen group. Inparticular, the alkoxy group, such as methoxy group or ethoxy group, ispreferable. R¹¹ is a hydrogen atom, a C₁₋₁₀ alkyl group, or a C₁₋₁₀alkyl group having a C₁₋₁₀ alkoxy group.

Examples of the hydrolyzable silane of Formula (2) wherein R⁷ is anorganic group of Formula (2-2) are as follows.

In the above-mentioned formulae, T is a hydrolyzable group, namely, theabove-mentioned alkoxy group, acyloxy group, or halogen group. Inparticular, the alkoxy group, such as methoxy group or ethoxy group, ispreferable.

Further examples of the hydrolyzable silane of Formula (2) wherein R⁷ isan organic group of Formula (2-2) are as follows:

glycidoxymethyltrimethoxysilane, glycidoxymethyltriethoxysilane,α-glycidoxyethyltrimethoxysilane, α-glycidoxyethyltriethoxysilane,β-glycidoxyethyltrimethoxysilane, β-glycidoxyethyltriethoxysilane,α-glycidoxypropyltrimethoxysilane, α-glycidoxypropyltriethoxysilane,β-glycidoxypropyltrimethoxysilane, β-glycidoxypropyltriethoxysilane,γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropyltriethoxysilane,γ-glycidoxypropyltripropoxysilane, γ-glycidoxypropyltributoxysilane,γ-glycidoxypropyltriphenoxysilane, α-glycidoxybutyltrimethoxysilane,α-glycidoxybutyltriethoxysilane, β-glycidoxybutyltriethoxysilane,γ-glycidoxybutyltrimethoxysilane, γ-glycidoxybutyltriethoxysilane,δ-glycidoxybutyltrimethoxysilane, δ-glycidoxybutyltriethoxysilane,(3,4-epoxycyclohexyl)methyltrimethoxysilane,(3,4-epoxycyclohexyl)methyltriethoxysilane,β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane,β-(3,4-epoxycyclohexyl)ethyltriethoxysilane,β-(3,4-epoxycyclohexyl)ethyltripropoxysilane,β-(3,4-epoxycyclohexyl)ethyltributoxysilane,β-(3,4-epoxycyclohexyl)ethyltriphenoxysilane,γ-(3,4-epoxycyclohexyl)propyltrimethoxysilane,γ-(3,4-epoxycyclohexyl)propyltriethoxysilane,δ-(3,4-epoxycyclohexyl)butyltrimethoxysilane,δ-(3,4-epoxycyclohexyl)butyltriethoxysilane,glycidoxymethylmethyldimethoxysilane,glycidoxymethylmethyldiethoxysilane,α-glycidoxyethylmethyldimethoxysilane,α-glycidoxyethylmethyldiethoxysilane,β-glycidoxyethylmethyldimethoxysilane,β-glycidoxyethylethyldimethoxysilane,α-glycidoxypropylmethyldimethoxysilane,α-glycidoxypropylmethyldiethoxysilane,β-glycidoxypropylmethyldimethoxysilane,β-glycidoxypropylethyldimethoxysilane,γ-glycidoxypropylmethyldimethoxysilane,γ-glycidoxypropylmethyldiethoxysilane,γ-glycidoxypropylmethyldipropoxysilane,γ-glycidoxypropylmethyldibutoxysilane,γ-glycidoxypropylmethyldiphenoxysilane,γ-glycidoxypropylethyldimethoxysilane,γ-glycidoxypropylethyldiethoxysilane,γ-glycidoxypropylvinyldimethoxysilane,γ-glycidoxypropylvinyldiethoxysilane, methoxyphenyltrimethoxysilane,methoxyphenyltriethoxysilane, methoxyphenyltriacetoxysilane,methoxyphenyltrichlorosilane, methoxybenzyltrimethoxysilane,methoxybenzyltriethoxysilane, methoxybenzyltriacetoxysilane,methoxybenzyltrichlorosilane, methoxyphenethyltrimethoxysilane,methoxyphenethyltriethoxysilane, methoxyphenethyltriacetoxysilane,methoxyphenethyltrichlorosilane, ethoxyphenyltrimethoxysilane,ethoxyphenyltriethoxysilane, ethoxyphenyltriacetoxysilane,ethoxyphenyltrichlorosilane, ethoxybenzyltrimethoxysilane,ethoxybenzyltriethoxysilane, ethoxybenzyltriacetoxysilane,ethoxybenzyltrichlorosilane, isopropoxyphenyltrimethoxysilane,isopropoxyphenyltriethoxysilane, isopropoxyphenyltriacetoxysilane,isopropoxyphenyltrichlorosilane, isopropoxybenzyltrimethoxysilane,isopropoxybenzyltriethoxysilane, isopropoxybenzyltriacetoxysilane,isopropoxybenzyltrichlorosilane, t-butoxyphenyltrimethoxysilane,t-butoxyphenyltriethoxysilane, t-butoxyphenyltriacetoxysilane,t-butoxyphenyltrichlorosilane, t-butoxybenzyltrimethoxysilane,t-butoxybenzyltriethoxysilane, t-butoxybenzyltriacetoxysilane,t-butoxybenzyltrichlorosilane, methoxynaphthyltrimethoxysilane,methoxynaphthyltriethoxysilane, methoxynaphthyltriacetoxysilane,methoxynaphthyltrichlorosilane, ethoxynaphthyltrimethoxysilane,ethoxynaphthyltriethoxysilane, ethoxynaphthyltriacetoxysilane,ethoxynaphthyltrichlorosilane, γ-chloropropyltrimethoxysilane,γ-chloropropyltriethoxysilane, γ-chloropropyltriacetoxysilane,3,3,3-trifluoropropyltrimethoxysilane,γ-methacryloxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane,γ-mercaptopropyltriethoxysilane, β-cyanoethyltriethoxysilane,chloromethyltrimethoxysilane, chloromethyltriethoxysilane,γ-chloropropylmethyldimethoxysilane, γ-chloropropylmethyldiethoxysilane,γ-methacryloxypropylmethyldimethoxysilane, andγ-methacryloxypropylmethyldiethoxysilane.

Furthermore, as the hydrolyzable silane of Formula (2) wherein R⁷ is anorganic group of Formula (2-2), the following hydrolyzable silanes mayalso be used.

Examples of the hydrolyzable silane of Formula (2) include ahydrolyzable silane of Formula (2) in which a phenolic hydroxy groupportion is protected with an alkyl group having an alkoxy group (analkoxyalkyl group). When a protective group of a polysiloxane obtainedby hydrolyzing and condensing the hydrolyzable silane of Formula (2)together with the hydrolyzable silane of Formula (1) and otherhydrolyzable silane by using an alkaline catalyst is deprotected usingan acid catalyst, the structure of the polysiloxane can contain astructure originated from the above-mentioned silane of Formula (2)having a phenolic hydroxy group.

Examples of the hydrolyzable silane of Formula (3) includetetramethoxysilane, tetrachlorosilane, tetraacetoxysilane,tetraethoxysilane, tetra-n-propoxysilane, tetraisopropoxysilane,tetra-n-butoxysilane, tetraacetoxysilane, methyltrimethoxysilane,methyltrichlorosilane, methyltriacetoxysilane, methyltripropoxysilane,methyltriacetoxysilane, methyltributoxysilane, methyltripropoxysilane,methyltriamyloxysilane, methyltriphenoxysilane,methyltribenzyloxysilane, methyltriphenethyloxysilane,ethyltrimethoxysilane, ethyltriethoxysilane, vinyltrimethoxysilane,vinyltrichlorosilane, vinyltriacetoxysilane, vinyltriethoxysilane,vinyltriacetoxysilane, dimethyldimethoxysilane,phenylmethyldimethoxysilane, dimethyldiethoxysilane,phenylmethyldiethoxysilane, dimethyldiacetoxysilane,γ-mercaptopropylmethyldimethoxysilane, γ-mercaptomethyldiethoxysilane,methylvinyldimethoxysilane, and methylvinyldiethoxysilane.

Examples of the hydrolyzable silane of Formula (4) includemethylenebistrimethoxysilane, methylenebistrichlorosilane,methylenebistriacetoxysilane, ethylenebistriethoxysilane,ethylenebistrichlorosilane, ethylenebistriacetoxysilane,propylenebistriethoxysilane, butylenebistrimethoxysilane,phenylenebistrimethoxysilane, phenylenebistriethoxysilane,phenylenebismethyldiethoxysilane, phenylenebismethyldimethoxysilane,naphthylenebistrimethoxysilane, bistrimethoxydisilane,bistriethoxydisilane, bisethyldiethoxydisilane, andbismethyldimethoxydisilane.

Furthermore, as the hydrolyzable silane of the present invention, asilane having a sulfone group and a silane having a sulfonamide groupmay also be used, and examples of the silanes are as follows.

Specific examples of the hydrolysis-condensation product (polysiloxane)used in the present invention are as follows.

The above-mentioned hydrolysis-condensation product (polyorganosiloxane)of the hydrolyzable silane can be obtained as a condensation producthaving a weight average molecular weight of 1,000 to 1,000,000, or 1,000to 100,000. The molecular weight is obtained by a GPC analysis in termsof polystyrene.

Measurement conditions for the GPC analysis are, for example, the useof: a GPC apparatus (trade name: HLC-8220GPC, manufactured by TosohCorporation); a GPC column (trade name: Shodex KF803L, KF802, or KF801,manufactured by Showa Denko K.K.); a column temperature of 40° C.;tetrahydrofuran as an eluting liquid (eluting solvent); a flow amount(flow rate) of 1.0 ml/min; and a polystyrene (manufactured by ShowaDenko K.K.) as a standard sample.

For hydrolysis of an alkoxysilyl group, an acyloxysilyl group, or ahalogenated silyl group, water is used in an amount of 0.5 mol to 100mol, preferably 1 mol to 10 mol per 1 mol of a hydrolyzable group.

A hydrolysis catalyst may be used in an amount of 0.001 mol to 10 mol,preferably 0.001 mol to 1 mol per 1 mol of a hydrolyzable group.

The reaction temperature for performing the hydrolysis and condensationis usually 20° C. to 80° C.

The hydrolysis may be performed either completely or partially. In otherwords, a hydrolysis product or a monomer may remain in ahydrolysis-condensation product. For the hydrolysis and condensation, acatalyst may be used.

Examples of the hydrolysis catalyst include metal chelate compounds,organic acids, inorganic acids, organic bases, and inorganic bases. Inparticular, a basic catalyst is preferable, and examples of such a basiccatalyst include organic bases.

Examples of the metal chelate compounds as the hydrolysis catalystinclude: titanium chelate compounds, such as triethoxymono(acetylacetonato)titanium, tri-n-propoxymono(acetylacetonato)titanium, tri-i-propoxymono(acetylacetonato)titanium, tri-n-butoxymono(acetylacetonato)titanium, tri-sec-butoxymono(acetylacetonato)titanium, tri-t-butoxymono(acetylacetonato)titanium, diethoxy bis(acetylacetonato)titanium,di-n-propoxy bis(acetylacetonato)titanium, di-i-propoxybis(acetylacetonato)titanium, di-n-butoxy bis(acetylacetonato)titanium,di-sec-butoxy bis(acetylacetonato)titanium, di-t-butoxybis(acetylacetonato)titanium, monoethoxy tris(acetylacetonato)titanium,mono-n-propoxy tris(acetylacetonato)titanium, mono-i-propoxytris(acetylacetonato)titanium, mono-n-butoxytris(acetylacetonato)titanium, mono-sec-butoxytris(acetylacetonato)titanium, mono-t-butoxytris(acetylacetonato)titanium, tetrakis(acetylacetonato)titanium,triethoxy mono(ethylacetoacetate)titanium, tri-n-propoxymono(ethylacetoacetate)titanium, tri-i-propoxymono(ethylacetoacetate)titanium, tri-n-butoxymono(ethylacetoacetate)titanium, tri-sec-butoxymono(ethylacetoacetate)titanium, tri-t-butoxymono(ethylacetoacetate)titanium, diethoxybis(ethylacetoacetate)titanium, di-n-propoxybis(ethylacetoacetate)titanium, di-i-propoxybis(ethylacetoacetate)titanium, di-n-butoxybis(ethylacetoacetate)titanium, di-sec-butoxybis(ethylacetoacetate)titanium, di-t-butoxybis(ethylacetoacetate)titanium, monoethoxytris(ethylacetoacetate)titanium, mono-n-propoxytris(ethylacetoacetate)titanium, mono-i-propoxytris(ethylacetoacetate)titanium, mono-n-butoxytris(ethylacetoacetate)titanium, mono-sec-butoxytris(ethylacetoacetate)titanium, mono-t-butoxytris(ethylacetoacetate)titanium, tetrakis(ethylacetoacetate)titanium,mono(acetylacetonato)tris(ethylacetoacetate)titanium,bis(acetylacetonato)bis(ethylacetoacetate)titanium, andtris(acetylacetonato)mono(ethylacetoacetate)titanium; zirconium chelatecompounds, such as triethoxy mono(acetylacetonato)zirconium,tri-n-propoxy mono(acetylacetonato)zirconium, tri-i-propoxymono(acetylacetonato)zirconium, tri-n-butoxymono(acetylacetonato)zirconium, tri-sec-butoxymono(acetylacetonato)zirconium, tri-t-butoxymono(acetylacetonato)zirconium, diethoxy bis(acetylacetonato)zirconium,di-n-propoxy bis(acetylacetonato)zirconium, di-i-propoxybis(acetylacetonato)zirconium, di-n-butoxybis(acetylacetonato)zirconium, di-sec-butoxybis(acetylacetonato)zirconium, di-t-butoxybis(acetylacetonato)zirconium, monoethoxytris(acetylacetonato)zirconium, mono-n-propoxytris(acetylacetonato)zirconium, mono-i-propoxytris(acetylacetonato)zirconium, mono-n-butoxytris(acetylacetonato)zirconium, mono-sec-butoxytris(acetylacetonato)zirconium, mono-t-butoxytris(acetylacetonato)zirconium, tetrakis(acetylacetonato)zirconium,triethoxy mono(ethylacetoacetate)zirconium, tri-n-propoxymono(ethylacetoacetate)zirconium, tri-i-propoxymono(ethylacetoacetate)zirconium, tri-n-butoxymono(ethylacetoacetate)zirconium, tri-sec-butoxymono(ethylacetoacetate)zirconium, tri-t-butoxymono(ethylacetoacetate)zirconium, diethoxybis(ethylacetoacetate)zirconium, di-n-propoxybis(ethylacetoacetate)zirconium, di-i-propoxybis(ethylacetoacetate)zirconium, di-n-butoxybis(ethylacetoacetate)zirconium, di-sec-butoxybis(ethylacetoacetate)zirconium, di-t-butoxybis(ethylacetoacetate)zirconium, monoethoxytris(ethylacetoacetate)zirconium, mono-n-propoxytris(ethylacetoacetate)zirconium, mono-i-propoxytris(ethylacetoacetate)zirconium, mono-n-butoxytris(ethylacetoacetate)zirconium, mono-sec-butoxytris(ethylacetoacetate)zirconium, mono-t-butoxytris(ethylacetoacetate)zirconium, tetrakis(ethylacetoacetate)zirconium,mono(acetylacetonato)tris(ethylacetoacetate)zirconium,bis(acetylacetonato)bis(ethylacetoacetate)zirconium, andtris(acetylacetonato)mono(ethylacetoacetate)zirconium; and aluminumchelate compounds, such as tris(acetylacetonato)aluminum andtris(ethylacetoacetate)aluminum.

Examples of the organic acids as the hydrolysis catalyst include aceticacid, propionic acid, butanoic acid, pentanoic acid, hexanoic acid,heptanoic acid, octanoic acid, nonanoic acid, decanoic acid, oxalicacid, maleic acid, methylmalonic acid, adipic acid, sebacic acid, gallicacid, butyric acid, mellitic acid, arachidonic acid, 2-ethylhexanoicacid, oleic acid, stearic acid, linoleic acid, linolenic acid, salicylicacid, benzoic acid, p-aminobenzoic acid, p-toluenesulfonic acid,benzenesulfonic acid, monochloroacetic acid, dichloroacetic acid,trichloroacetic acid, trifluoroacetic acid, formic acid, malonic acid,sulfonic acid, methanesulfonic acid, phthalic acid, fumaric acid, citricacid, and tartaric acid.

Examples of the inorganic acids as the hydrolysis catalyst includehydrochloric acid, nitric acid, sulfuric acid, hydrofluoric acid, andphosphoric acid.

Examples of the organic bases as the hydrolysis catalyst includeammonia, pyridine, pyrrole, piperazine, pyrrolidine, piperidine,picoline, trimethylamine, triethylamine, monoethanolamine,diethanolamine, dimethylmonoethanolamine, monomethyldiethanolamine,triethanolamine, diazabicyclooctane, diazabicyclononane,diazabicycloundecene, tetramethylammonium hydroxide, tetraethylammoniumhydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide,trimethylphenylammonium hydroxide, benzyltrimethylammonium hydroxide,benzyltriethylammonium hydroxide, and triphenylsulfonium hydroxide.

Examples of the inorganic bases include sodium hydroxide, potassiumhydroxide, barium hydroxide, and calcium hydroxide. Among thesecatalysts, the metal chelate compounds, the organic acids, and theinorganic acids are preferable, and these catalysts may be used singlyor in combination of two or more of them. Furthermore, from a viewpointof the remaining of these metals, the organic bases are preferably usedfor semiconductors and electronic devices.

Examples of the organic solvent used for the hydrolysis include:aliphatic hydrocarbon-based solvents, such as n-pentane, i-pentane,n-hexane, i-hexane, n-heptane, i-heptane, 2,2,4-trimethylpentane,n-octane, i-octane, cyclohexane, and methylcyclohexane; aromatichydrocarbon-based solvents, such as benzene, toluene, xylene,ethylbenzene, trimethylbenzene, methylethylbenzene, n-propylbenzene,i-propylbenzene, diethylbenzene, i-butylbenzene, triethylbenzene,di-i-propylbenzene, n-amylnaphthalene, and trimethylbenzene; monohydricalcohol-based solvents, such as methanol, ethanol, n-propanol,i-propanol, n-butanol, i-butanol, sec-butanol, t-butanol, n-pentanol,i-pentanol, 2-methylbutanol, sec-pentanol, t-pentanol, 3-methoxybutanol,n-hexanol, 2-methylpentanol, sec-hexanol, 2-ethylbutanol, sec-heptanol,heptanol-3, n-octanol, 2-ethylhexanol, sec-octanol, n-nonyl alcohol,2,6-dimethylheptanol-4, n-decanol, sec-undecyl alcohol, trimethylnonylalcohol, sec-tetradecyl alcohol, sec-heptadecyl alcohol, phenol,cyclohexanol, methylcyclohexanol, 3,3,5-trimethylcyclohexanol, benzylalcohol, phenylmethylcarbinol, diacetone alcohol, and cresol; polyhydricalcohol-based solvents, such as ethylene glycol, propylene glycol,1,3-butylene glycol, pentanediol-2,4, 2-methylpentanediol-2,4,hexanediol-2,5, heptanediol-2,4, 2-ethylhexanediol-1,3, diethyleneglycol, dipropylene glycol, triethylene glycol, tripropylene glycol, andglycerol; ketone-based solvents, such as acetone, methyl ethyl ketone,methyl-n-propyl ketone, methyl-n-butyl ketone, diethyl ketone,methyl-1-butyl ketone, methyl-n-pentyl ketone, ethyl-n-butyl ketone,methyl-n-hexyl ketone, di-i-butyl ketone, trimethylnonanone,cyclohexanone, methylcyclohexanone, 2,4-pentanedione, acetonylacetone,diacetone alcohol, acetophenone, and fenchone; ether-based solvents,such as ethyl ether, i-propyl ether, n-butyl ether, n-hexyl ether,2-ethylhexyl ether, ethylene oxide, 1,2-propylene oxide, dioxolane,4-methyldioxolane, dioxane, dimethyldioxane, ethylene glycol monomethylether, ethylene glycol monoethyl ether, ethylene glycol diethyl ether,ethylene glycol mono-n-butyl ether, ethylene glycol mono-n-hexyl ether,ethylene glycol monophenyl ether, ethylene glycol mono-2-ethylbutylether, ethylene glycol dibutyl ether, diethylene glycol monomethylether, diethylene glycol monoethyl ether, diethylene glycol diethylether, diethylene glycol mono-n-butyl ether, diethylene glycoldi-n-butyl ether, diethylene glycol mono-n-hexyl ether, ethoxytriglycol,tetraethylene glycol di-n-butyl ether, propylene glycol monomethylether, propylene glycol monoethyl ether, propylene glycol monopropylether, propylene glycol monobutyl ether, propylene glycol monomethylether acetate, dipropylene glycol monomethyl ether, dipropylene glycolmonoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycolmonobutyl ether, tripropylene glycol monomethyl ether, tetrahydrofuran,and 2-methyltetrahydrofuran; ester-based solvents, such as diethylcarbonate, methyl acetate, ethyl acetate, γ-butyrolactone,γ-valerolactone, n-propyl acetate, i-propyl acetate, n-butyl acetate,i-butyl acetate, sec-butyl acetate, n-pentyl acetate, sec-pentylacetate, 3-methoxybutyl acetate, methylpentyl acetate, 2-ethylbutylacetate, 2-ethylhexyl acetate, benzyl acetate, cyclohexyl acetate,methylcyclohexyl acetate, n-nonyl acetate, methyl acetoacetate, ethylacetoacetate, ethylene glycol monomethyl ether acetate, ethylene glycolmonoethyl ether acetate, diethylene glycol monomethyl ether acetate,diethylene glycol monoethyl ether acetate, diethylene glycolmono-n-butyl ether acetate, propylene glycol monomethyl ether acetate,propylene glycol monoethyl ether acetate, propylene glycol monopropylether acetate, propylene glycol monobutyl ether acetate, dipropyleneglycol monomethyl ether acetate, dipropylene glycol monoethyl etheracetate, glycol diacetate, methoxytriglycol acetate, ethyl propionate,n-butyl propionate, i-amyl propionate, diethyl oxalate, di-n-butyloxalate, methyl lactate, ethyl lactate, n-butyl lactate, n-amyl lactate,diethyl malonate, dimethyl phthalate, and diethyl phthalate;nitrogen-containing solvents, such as N-methylformamide,N,N-dimethylformamide, N,N-diethylformamide, acetamide,N-methylacetamide, N,N-dimethylacetamide, N-methylpropionamide, andN-methylpyrrolidone; and sulfur-containing solvents, such as dimethylsulfide, diethyl sulfide, thiophene, tetrahydrothiophene, dimethylsulfoxide, sulfolane, and 1,3-propanesultone. These solvents may be usedsingly or in combination of two or more of them.

From a hydrolysis-condensation product (a polymer) obtained byhydrolyzing and condensing a hydrolyzable silane in a solvent using acatalyst, alcohol as a by-product, the used hydrolysis catalyst, andwater can be removed at the same time by distillation under reducedpressure, for example. Furthermore, an acid or a base catalyst that isused for the hydrolysis can be removed by neutralization or ionexchange. In the radiation sensitive composition of the presentinvention, an organic acid, water, and alcohol, or a combination thereofmay be added for the purpose of stabilizing a resist underlayerfilm-forming composition including the hydrolysis-condensation product.

Examples of the organic acid include acetic acid, oxalic acid, malonicacid, methylmalonic acid, succinic acid, maleic acid, malic acid,tartaric acid, phthalic acid, citric acid, glutaric acid, citric acid,lactic acid, and salicylic acid. Among these organic acids, for example,oxalic acid and maleic acid are preferable. The amount of the organicacid added is 0.1 part by mass to 5.0 parts by mass with respect to 100parts by mass of the condensation product (polyorganosiloxane).Furthermore, pure water, ultrapure water, or ion exchange water may beused as water to be added, and the amount of water added may be 1 partby mass to 20 parts by mass with respect to 100 parts by mass of theresist underlayer film-forming composition.

As the alcohol to be added, alcohol that can easily disperse by heatingafter application is preferable, and examples of the alcohol includemethanol, ethanol, propanol, isopropanol (2-propanol), and butanol. Theamount of the alcohol added may be 1 part by mass to 20 parts by masswith respect to 100 parts by mass of the resist underlayer film-formingcomposition.

In the present invention, an acid may be added to deprotect a phenolichydroxy group of Formula (2) that is protected with an alkoxy alkylgroup. Examples of the acid to be added include organic acids, andinorganic acid such as hydrochloric acid. An inorganic acid, such ashydrochloric acid, is preferably used.

Besides the above-mentioned components, the radiation sensitivecomposition of the present invention may contain an organic polymercompound, a photoacid generator, and a surfactant, as necessary.

The organic polymer compound is not limited to a particular compound,and various kinds of organic polymers may be used. For example,polycondensation polymers and addition polymerization polymers may beused. Examples of the addition polymerization polymers and thepolycondensation polymers to be used include polyesters, polystyrenes,polyimides, acrylic polymers, methacrylic polymers, polyvinyl ethers,phenol novolacs, naphthol novolacs, polyethers, polyamides, andpolycarbonates. An organic polymer having an aromatic ring structurethat functions as a light absorbing moiety, such as a benzene ring, anaphthalene ring, an anthracene ring, a triazine ring, a quinoline ring,or a quinoxaline ring, is preferably used.

As the organic polymer compound, a polymer compound having a weightaverage molecular weight of, for example, 1,000 to 1,000,000, 3,000 to300,000, 5,000 to 200,000, or 10,000 to 100,000 may be used.

The organic polymer compounds may be used singly or in combination oftwo or more of them.

In the case of using the organic polymer compound, the proportion of theorganic polymer compound is 1 part by mass to 200 parts by mass, 5 partsby mass to 100 parts by mass, 10 parts by mass to 50 parts by mass, or20 parts by mass to 30 parts by mass with respect to 100 parts by massof the condensation product (polyorganosiloxane).

The radiation sensitive composition of the present invention includes acompound (a photoacid generator) that senses active rays or radiation togenerate an acid. As the photoacid generator component, any compoundthat generates an acid when irradiated with high energy beam may beemployed.

Preferred examples of the photoacid generator include sulfonium salts,iodonium salts, sulfonyldiazomethane, N-sulfonyloxyimide, abenzoinsulfonate type photoacid generator, a pyrogallol trisulfonatetype photoacid generator, a sulfone type photoacid generator, a glyoximederivative type photoacid generator, an oxime-O-sulfonate type acidgenerator, and a bisoxime sulfonate type acid generator. Althoughdescribed in detail below, these photoacid generators may be used singlyor in combination of two or more of them.

The sulfonium salt is a salt composed of a sulfonium cation, andsulfonate, bis(substituted alkylsulfonyl)imide, or tris(substitutedalkylsulfonyl)methide.

Examples of the sulfonium cation include triphenylsulfonium,(4-tert-butoxyphenyl)diphenylsulfonium,bis(4-tert-butoxyphenyl)phenylsulfonium,tris(4-tert-butoxyphenyl)sulfonium,β-tert-butoxyphenyl)diphenylsulfonium,bis(3-tert-butoxyphenyl)phenylsulfonium,tris(3-tert-butoxyphenyl)sulfonium,(3,4-di-tert-butoxyphenyl)diphenylsulfonium,bis(3,4-di-tert-butoxyphenyl)phenylsulfonium,tris(3,4-di-tert-butoxyphenyl)sulfonium, diphenyl(4-thiophenoxyphenyl)sulfonium, (4-tert-butoxycarbonylmethyloxyphenyl)diphenylsulfonium,tris(4-tert-butoxycarbonylmethyloxyphenyl)sulfonium,(4-tert-butoxyphenyl)bis(4-dimethylaminophenyl)sulfonium,tris(4-dimethylaminophenyl)sulfonium, 2-naphthyldiphenylsulfonium,dimethyl-2-naphthylsulfonium, 4-hydroxyphenyldimethylsulfonium,4-methoxyphenyldimethylsulfonium, trimethylsulfonium,2-oxocyclohexylcyclohexylmethylsulfonium, trinaphthylsulfonium,tribenzylsulfonium, diphenylmethylsulfonium, dimethylphenylsulfonium,2-oxo-2-phenylethylthiacyclopentanium,4-n-butoxynaphthyl-1-thiacyclopentanium, and2-n-butoxynaphthyl-1-thiacyclopentanium.

Examples of the sulfonate include trifluoromethanesulfonate,pentafluoroethanesulfonate, nonafluorobutanesulfonate,dodecafluorohexanesulfonate,pentafluoroethylperfluorocyclohexanesulfonate,heptadecafluorooctanesulfonate, 2,2,2-trifluoroethanesulfonate,pentafluorobenzenesulfonate, 4-trifluoromethylbenzenesulfonate,4-fluorobenzenesulfonate, mesitylenesulfonate,2,4,6-triisopropylbenzenesulfonate, toluenesulfonate, benzenesulfonate,4-(4′-toluenesulfonyloxy)benzenesulfonate, naphthalenesulfonate,camphorsulfonate, octanesulfonate, dodecylbenzenesulfonate,butanesulfonate, methanesulfonate,2-benzoyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-(4-phenylbenzoyloxy)propanesulfonate,1,1,3,3,3-pentafluoro-2-pivaloyloxypropanesulfonate,2-cyclohexanecarbonyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-furoyloxypropanesulfonate,2-naphthoyloxy-1,1,3,3,3-pentafluoropropanesulfonate,2-(4-tert-butylbenzoyloxy)-1,1,3,3,3-pentafluoropropanesulfonate,2-adamantanecarbonyloxy-1,1,3,3,3-pentafluoropropanesulfonate,2-acetyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-hydroxypropanesulfonate,1,1,3,3,3-pentafluoro-2-tosyloxypropanesulfonate,1,1-difluoro-2-naphthyl-ethanesulfonate,1,1,2,2-tetrafluoro-2-(norbornan-2-yl)ethanesulfonate, and1,1,2,2-tetrafluoro-2-(tetracyclo[4.4.0.12,5.17,10]dodeca-3-en-8-yl)ethanesulfonate.

Examples of the bis(substituted alkylsulfonyl)imide includebistrifluoromethylsulfonylimide, bispentafluoroethylsulfonylimide,bisheptafluoropropylsulfonylimide, and 1,3-propylenebissulfonylimide.

Examples of the tris(substituted alkylsulfonyl)methide includetristrifluoromethylsulfonylmethide. Examples of the sulfonium saltinclude sulfonium salts composed of combinations of the above-mentionedsulfonium cations, and the above-mentioned sulfonates, bis(substitutedalkylsulfonyl)imides, or tris(substituted alkylsulfonyl)methides.

The iodonium salt is a salt composed of an iodonium cation, andsulfonate, bis(substituted alkylsulfonyl)imide, or tris(substitutedalkylsulfonyl)methide.

Examples of the iodonium cation include aryl iodonium cations, such asdiphenyliodonium, bis(4-tert-butylphenyl)iodonium,4-tert-butoxyphenylphenyliodonium, and 4-methoxyphenylphenyliodonium.Examples of the sulfonate, the bis(substituted alkylsulfonyl)imide, andthe tris(substituted alkylsulfonyl)methide include the above-mentionedexamples. Examples of the iodonium salt include iodonium salts composedof combinations of the above-mentioned iodonium cations, and theabove-mentioned sulfonates, bis(substituted alkylsulfonyl)imides, ortris(substituted alkylsulfonyl)methides.

Examples of the sulfonyldiazomethane include bissulfonyldiazomethanesand sulfonyl-carbonyldiazomethanes, such asbis(ethylsulfonyl)diazomethane, bis(1-methylpropylsulfonyl)diazomethane,bis(2-methylpropylsulfonyl)diazomethane,bis(1,1-dimethylethylsulfonyl)diazomethane,bis(cyclohexylsulfonyl)diazomethane,bis(perfluoroisopropylsulfonyl)diazomethane,bis(phenylsulfonyl)diazomethane,bis(4-methylphenylsulfonyl)diazomethane,bis(2,4-dimethylphenylsulfonyl)diazomethane,bis(2-naphthylsulfonyl)diazomethane,bis(4-acetyloxyphenylsulfonyl)diazomethane,bis(4-methanesulfonyloxyphenylsulfonyl)diazomethane,bis(4-(4-toluenesulfonyloxy)phenylsulfonyl)diazomethane,bis(4-n-hexyloxy)phenylsulfonyl)diazomethane,bis(2-methyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(2,5-dimethyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(3,5-dimethyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(2-methyl-5-isopropyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,4-methylphenylsulfonylbenzoyldiazomethane,tert-butylcarbonyl-4-methylphenylsulfonyldiazomethane,2-naphthylsulfonylbenzoyldiazomethane,4-methylphenylsulfonyl-2-naphthoyldiazomethane,methylsulfonylbenzoyldiazomethane, andtert-butoxycarbonyl-4-methylphenylsulfonyldiazomethane.

Examples of the N-sulfonyloxyimide type photoacid generator include acombination of a sulfonate and an imide skeleton such as succinimide,naphthalenedicarboxylic acid imide, phthalimide, cyclohexyldicarboxylicacid imide, 5-norbornene-2,3-dicarboxylic acid imide, or7-oxabicyclo[2.2.1]-5-heptene-2,3-dicarboxylic acid imide.

Examples of the sulfonate include trifluoromethanesulfonate,pentafluoroethanesulfonate, nonafluorobutanesulfonate,dodecafluorohexanesulfonate,pentafluoroethylperfluorocyclohexanesulfonate,heptadecafluorooctanesulfonate, 2,2,2-trifluoroethanesulfonate,pentafluorobenzenesulfonate, 4-trifluoromethylbenzenesulfonate,4-fluorobenzenesulfonate, mesitylenesulfonate,2,4,6-triisopropylbenzenesulfonate, toluenesulfonate, benzenesulfonate,naphthalenesulfonate, camphorsulfonate, octanesulfonate,dodecylbenzenesulfonate, butanesulfonate, methanesulfonate,2-benzoyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-(4-phenylbenzoyloxy)propanesulfonate,1,1,3,3,3-pentafluoro-2-pivaloyloxypropanesulfonate,2-cyclohexanecarbonyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-furoyloxypropanesulfonate,2-naphthoyloxy-1,1,3,3,3-pentafluoropropanesulfonate,2-(4-tert-butylbenzoyloxy)-1,1,3,3,3-pentafluoropropanesulfonate,2-adamantanecarbonyloxy-1,1,3,3,3-pentafluoropropanesulfonate,2-acetyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-hydroxypropanesulfonate,1,1,3,3,3-pentafluoro-2-tosyloxypropanesulfonate,1,1-difluoro-2-naphthyl-ethanesulfonate,1,1,2,2-tetrafluoro-2-(norbornan-2-yl)ethanesulfonate, and1,1,2,2-tetrafluoro-2-(tetracyclo[4.4.0.12,5.17,10]dodeca-3-en-8-yl)ethanesulfonate,and compounds of combinations thereof.

Examples of the benzoinsulfonate type photoacid generator includebenzoin tosylate, benzoin mesylate, and benzoin butanesulfonate.

Examples of the pyrogallol trisulfonate type photoacid generator includecompounds formed by substituting all hydroxy groups of pyrogallol,fluoroglycinol, catechol, resorcinol, or hydroquinone with a substituentmentioned below. Examples of the substituent includetrifluoromethanesulfonate, pentafluoroethanesulfonate,nonafluorobutanesulfonate, dodecafluorohexanesulfonate,pentafluoroethylperfluorocyclohexanesulfonate,heptadecafluorooctanesulfonate, 2,2,2-trifluoroethanesulfonate,pentafluorobenzenesulfonate, 4-trifluoromethylbenzenesulfonate,4-fluorobenzenesulfonate, toluenesulfonate, benzenesulfonate,naphthalenesulfonate, camphorsulfonate, octanesulfonate,dodecylbenzenesulfonate, butanesulfonate, methanesulfonate,2-benzoyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-(4-phenylbenzoyloxy)propanesulfonate,1,1,3,3,3-pentafluoro-2-pivaloyloxypropanesulfonate,2-cyclohexanecarbonyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-furoyloxypropanesulfonate,2-naphthoyloxy-1,1,3,3,3-pentafluoropropanesulfonate,2-(4-tert-butylbenzoyloxy)-1,1,3,3,3-pentafluoropropanesulfonate,2-adamantanecarbonyloxy-1,1,3,3,3-pentafluoropropanesulfonate,2-acetyloxy-1,1,3,3,3-pentafluoropropanesulfonate,1,1,3,3,3-pentafluoro-2-hydroxypropanesulfonate,1,1,3,3,3-pentafluoro-2-tosyloxypropanesulfonate,1,1-difluoro-2-naphthyl-ethanesulfonate,1,1,2,2-tetrafluoro-2-(norbornan-2-yl)ethanesulfonate, and1,1,2,2-tetrafluoro-2-(tetracyclo[4.4.0.12,5.17,10]dodeca-3-en-8-yl)ethanesulfonate,and examples of the pyrogallol trisulfonate type photoacid generatorinclude compounds obtained by substitution with these substituents.

Examples of the sulfone type photoacid generator includebis(phenylsulfonyl)methane, bis(4-methylphenylsulfonyl)methane,bis(2-naphthylsulfonyl)methane, 2,2-bis(phenylsulfonyl)propane, 2,2-bis(4-methylphenylsulfonyl)propane, 2,2-bis(2-naphthylsulfonyl)propane,2-methyl-2-(p-toluenesulfonyl)propiophenone,2-cyclohexylcarbonyl-2-(p-toluenesulfonyl)propane, and2,4-dimethyl-2-(p-toluenesulfonyl)pentan-3-one.

Examples of the glyoxime derivative type photoacid generator includebis-O-(p-toluenesulfonyl)-α-dimethylglyoxime,bis-O-(p-toluenesulfonyl)-α-diphenylglyoxime,bis-O-(p-toluenesulfonyl)-α-dicyclohexylglyoxime,bis-O-(p-toluenesulfonyl)-2,3-pentanedioneglyoxime,bis-O-(n-butanesulfonyl)-α-dimethylglyoxime,bis-O-(n-butanesulfonyl)-α-diphenylglyoxime,bis-O-(n-butanesulfonyl)-α-dicyclohexylglyoxime,bis-O-(methanesulfonyl)-α-dimethylglyoxime,bis-O-(trifluoromethanesulfonyl)-α-dimethylglyoxime,bis-O-(2,2,2-trifluoroethanesulfonyl)-α-dimethylglyoxime,bis-O-(10-camphorsulfonyl)-α-dimethylglyoxime,bis-O-(benzenesulfonyl)-α-dimethylglyoxime,bis-O-(p-fluorobenzenesulfonyl)-α-dimethylglyoxime,bis-O-(p-trifluoromethylbenzenesulfonyl)-α-dimethylglyoxime,bis-O-(xylenesulfonyl)-α-dimethylglyoxime,bis-O-(trifluoromethanesulfonyl)-nioxime,bis-O-(2,2,2-trifluoroethanesulfonyl)-nioxime,bis-O-(10-camphorsulfonyl)-nioxime, bis-O-(benzenesulfonyl)-nioxime,bis-O-(p-fluorobenzenesulfonyl)-nioxime,bis-O-(p-trifluoromethylbenzenesulfonyl)-nioxime, andbis-O-(xylenesulfonyl)-nioxime.

Examples of the oxime-O-sulfonate type photoacid generator include(5-(4-toluenesulfonyl)oxyimino-5H-thiophen-2-ylidene)phenylacetonitrile,(5-(10-camphorsulfonyl)oxyimino-5H-thiophen-2-ylidene)phenylacetonitrile,(5-n-octanesulfonyloxyimino-5H-thiophen-2-ylidene)phenylacetonitrile,(5-(4-toluenesulfonyl)oxyimino-5H-thiophen-2-ylidene)(2-methylphenyl)acetonitrile,(5-(10-camphorsulfonyl)oxyimino-5H-thiophen-2-ylidene)(2-methylphenyl)acetonitrile,and(5-n-octanesulfonyloxyimino-5H-thiophen-2-ylidene)(2-methylphenyl)acetonitrile.Further examples thereof include(5-(4-(4-toluenesulfonyloxy)benzenesulfonyl)oxyimino-5H-thiophen-2-ylidene)phenylacetonitrile,and(5-(2,5-bis(4-toluenesulfonyloxy)benzenesulfonyl)oxyimino-5H-thiophen-2-ylidene)phenylacetonitrile.

Further examples of the oxime-O-sulfonate type photoacid generatorinclude 2,2,2-trifluoro-1-phenyl-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-phenyl-ethanoneoxime-O-(10-camphorylsulfonate),2,2,2-trifluoro-1-phenyl-ethanoneoxime-O-(4-methoxyphenylsulfonate),2,2,2-trifluoro-1-phenyl-ethanoneoxime-O-(1-naphthylsulfonate),2,2,2-trifluoro-1-phenyl-ethanoneoxime-O-(2-naphthylsulfonate),2,2,2-trifluoro-1-phenyl-ethanoneoxime-O-(2,4,6-trimethylphenylsulfonate),2,2,2-trifluoro-1-(4-methylphenyl)-ethanoneoxime-O-(10-camphorylsulfonate),2,2,2-trifluoro-1-(4-methylphenyl)-ethanoneoxime-O-(methylsulfonate),2,2,2-trifluoro-1-(2-methylphenyl)-ethanoneoxime-O-(10-camphorylsulfonate),2,2,2-trifluoro-1-(2,4-dimethylphenyl)-ethanoneoxime-O-(10-camphorylsulfonate),2,2,2-trifluoro-1-(2,4-dimethylphenyl)-ethanoneoxime-O-(1-naphthylsulfonate),2,2,2-trifluoro-1-(2,4-dimethylphenyl)-ethanoneoxime-O-(2-naphthylsulfonate),2,2,2-trifluoro-1-(2,4,6-trimethylphenyl)-ethanoneoxime-O-(10-camphorylsulfonate),2,2,2-trifluoro-1-(2,4,6-trimethylphenyl)-ethanoneoxime-O-(1-naphthylsulfonate),2,2,2-trifluoro-1-(2,4,6-trimethylphenyl)-ethanoneoxime-O-(2-naphthylsulfonate),2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(4-methylthiophenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(3,4-dimethoxyphenyl)-ethanoneoxime-O-methylsulfonate,2,2,3,3,4,4,4-heptafluoro-1-phenyl-butanoneoxime-O-(10-camphorylsulfonate),2,2,2-trifluoro-1-(phenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(phenyl)-ethanoneoxime-O-10-camphorylsulfonate,2,2,2-trifluoro-1-(phenyl)-ethanoneoxime-O-(4-methoxyphenyl)sulfonate,2,2,2-trifluoro-1-(phenyl)-ethanoneoxime-O-(1-naphthyl)sulfonate,2,2,2-trifluoro-1-(phenyl)-ethanoneoxime-O-(2-naphthyl)sulfonate,2,2,2-trifluoro-1-(phenyl)-ethanoneoxime-O-(2,4,6-trimethylphenyl)sulfonate,2,2,2-trifluoro-1-(4-methylphenyl)-ethanoneoxime-O-(10-camphoryl)sulfonate,2,2,2-trifluoro-1-(4-methylphenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(2-methylphenyl)-ethanoneoxime-O-(10-camphoryl)sulfonate,2,2,2-trifluoro-1-(2,4-dimethylphenyl)-ethanoneoxime-O-(1-naphthyl)sulfonate,2,2,2-trifluoro-1-(2,4-dimethylphenyl)-ethanoneoxime-O-(2-naphthyl)sulfonate,2,2,2-trifluoro-1-(2,4,6-trimethylphenyl)-ethanoneoxime-O-(10-camphoryl)sulfonate,2,2,2-trifluoro-1-(2,4,6-trimethylphenyl)-ethanoneoxime-O-(1-naphthyl)sulfonate,2,2,2-trifluoro-1-(2,4,6-trimethylphenyl)-ethanoneoxime-O-(2-naphthyl)sulfonate,2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(4-thiomethylphenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(3,4-dimethoxyphenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanoneoxime-O-(4-methylphenyl)sulfonate,2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanoneoxime-O-(4-methoxyphenyl)sulfonate,2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanoneoxime-O-(4-dodecylphenyl)sulfonate,2,2,2-trifluoro-1-(4-methoxyphenyl)-ethanoneoxime-O-octylsulfonate,2,2,2-trifluoro-1-(4-thiomethylphenyl)-ethanoneoxime-O-(4-methoxyphenyl)sulfonate,2,2,2-trifluoro-1-(4-thiomethylphenyl)-ethanoneoxime-O-(4-dodecylphenyl)sulfonate,2,2,2-trifluoro-1-(4-thiomethylphenyl)-ethanoneoxime-O-octylsulfonate,2,2,2-trifluoro-1-(4-thiomethylphenyl)-ethanoneoxime-O-(2-naphthyl)sulfonate,2,2,2-trifluoro-1-(2-methylphenyl)-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-(4-methylphenyl)-ethanoneoxime-O-phenylsulfonate,2,2,2-trifluoro-1-(4-chlorophenyl)-ethanoneoxime-O-phenylsulfonate,2,2,3,3,4,4,4-heptafluoro-1-(phenyl)-butanoneoxime-O-(10-camphoryl)sulfonate,2,2,2-trifluoro-1-naphthyl-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-2-naphthyl-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-[4-benzylphenyl]-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-[4-(phenyl-1,4-dioxa-but-1-yl)phenyl]-ethanoneoxime-O-methylsulfonate,2,2,2-trifluoro-1-naphthyl-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-2-naphthyl-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[4-benzylphenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[4-methylsulfonylphenyl]-ethanoneoxime-O-propylsulfonate,1,3-bis[1-(4-phenoxyphenyl)-2,2,2-trifluoroethanoneoxime-O-sulfonyl]phenyl,2,2,2-trifluoro-1-[4-methylsulfonyloxyphenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[4-methylcarbonyloxyphenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[6H,7H-5,8-dioxonaphth-2-yl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[4-methoxycarbonylmethoxyphenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[4-(methoxycarbonyl)-(4-amino-1-oxa-pent-1-yl)-phenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[3,5-dimethyl-4-ethoxyphenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[4-benzyloxyphenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[2-thiophenyl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-[1-dioxa-thiophen-2-yl]-ethanoneoxime-O-propylsulfonate,2,2,2-trifluoro-1-(4-β-(4-(2,2,2-trifluoro-1-(trifluoromethanesulfonyloxyimino)-ethyl)-phenoxy)-propoxy)-phenyl)ethanoneoxime(trifluoromethanesulfonate),2,2,2-trifluoro-1-(4-β-(4-(2,2,2-trifluoro-1-(1-propanesulfonyloxyimino)-ethyl)-phenoxy)-propoxy)-phenyl)ethanoneoxime(1-propanesulfonate),and2,2,2-trifluoro-1-(4-β-(4-(2,2,2-trifluoro-1-(1-butanesulfonyloxyimino)-ethyl)-phenoxy)-propoxy)-phenyl)ethanoneoxime(1-butanesulfonate).

Further examples thereof include2,2,2-trifluoro-1-(4-β-(4-(2,2,2-trifluoro-1-(4-(4-methylphenylsulfonyloxy)phenylsulfonyloxyimino)-ethyl)-phenoxy)-propoxy)-phenyl)ethanoneoxime(4-(4-methylphenylsulfonyloxy)phenylsulfonate),and2,2,2-trifluoro-1-(4-β-(4-(2,2,2-trifluoro-1-(2,5-bis(4-methylphenylsulfonyloxy)benzenesulfonyloxy)phenylsulfonyloxyimino)-ethyl)-phenoxy)-propoxy)-phenyl)ethanoneoxime(2,5-bis(4-methylphenylsulfonyloxy)benzenesulfonyloxy)phenylsulfonate).

Further examples of the oxime-O-sulfonate type photoacid generatorinclude α-(p-toluenesulfonyloxyimino)-phenylacetonitrile,α-(p-chlorobenzenesulfonyloxyimino)-phenylacetonitrile,α-(4-nitrobenzenesulfonyloxyimino)-phenylacetonitrile,α-(4-nitro-2-trifluoromethylbenzenesulfonyloxyimino)-phenylacetonitrile,α-(benzenesulfonyloxyimino)-4-chlorophenylacetonitrile,α-(benzenesulfonyloxyimino)-2,4-dichlorophenylacetonitrile,α-(benzenesulfonyloxyimino)-2,6-dichlorophenylacetonitrile,α-(benzenesulfonyloxyimino)-4-methoxyphenylacetonitrile,α-(2-chlorobenzenesulfonyloxyimino)-4-methoxyphenylacetonitrile,α-(benzenesulfonyloxyimino)-2-thienylacetonitrile,α-(4-dodecylbenzenesulfonyloxyimino)-phenylacetonitrile,α-[(4-toluenesulfonyloxyimino)-4-methoxyphenyl]acetonitrile,α-[(dodecylbenzenesulfonyloxyimino)-4-methoxyphenyl]acetonitrile,α-(tosyloxyimino)-3-thienylacetonitrile,α-(methylsulfonyloxyimino)-1-cyclopentenylacetonitrile,α-(ethylsulfonyloxyimino)-1-cyclopentenylacetonitrile,α-(isopropylsulfonyloxyimino)-1-cyclopentenylacetonitrile,α-(n-butylsulfonyloxyimino)-1-cyclopentenylacetonitrile,α-(ethylsulfonyloxyimino)-1-cyclohexenylacetonitrile,α-(isopropylsulfonyloxyimino)-1-cyclohexenylacetonitrile, andα-(n-butylsulfonyloxyimino)-1-cyclohexenylacetonitrile.

Further examples of the oxime-O-sulfonate type photoacid generatorinclude2-[2,2,3,3,4,4,5,5-octafluoro-1-(nonafluorobutylsulfonyloxyimino)-pentyl]-fluorene,2-[2,2,3,3,4,4-pentafluoro-1-(nonafluorobutylsulfonyloxyimino)-butyl]-fluorene,2-[2,2,3,3,4,4,5,5,6,6-decafluoro-1-(nonafluorobutylsulfonyloxyimino)-hexyl]-fluorene,2-[2,2,3,3,4,4,5,5-octafluoro-1-(nonafluorobutylsulfonyloxyimino)-pentyl]-4-biphenyl,2-[2,2,3,3,4,4-pentafluoro-1-(nonafluorobutylsulfonyloxyimino)-butyl]-4-biphenyl,and2-[2,2,3,3,4,4,5,5,6,6-decafluoro-1-(nonafluorobutylsulfonyloxyimino)-hexyl]-4-biphenyl

Examples of the bisoxime sulfonate type photoacid generator include, inparticular,bis(α-(4-toluenesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(benzenesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(methanesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(butanesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(10-camphorsulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(4-toluenesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(trifluoromethanesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(4-methoxybenzenesulfonyloxy)imino)-p-phenylenediacetonitrile,bis(α-(4-toluenesulfonyloxy)imino)-m-phenylenediacetonitrile,bis(α-(benzenesulfonyloxy)imino)-m-phenylenediacetonitrile,bis(α-(methanesulfonyloxy)imino)-m-phenylenediacetonitrile,bis(α-(butanesulfonyloxy)imino)-m-phenylenediacetonitrile,bis(α-(10-camphorsulfonyloxy)imino)-m-phenylenediacetonitrile,bis(α-(4-toluenesulfonyloxy)imino)-m-phenylenediacetonitrile,bis(α-(trifluoromethanesulfonyloxy)imino)-m-phenylenediacetonitrile, andbis(α-(4-methoxybenzenesulfonyloxy)imino)-m-phenylenediacetonitrile.

In particular, sulfonium salts, bissulfonyldiazomethane,N-sulfonyloxyimide, oxime-O-sulfonate, and glyoxime derivative photoacidgenerators are preferably used as the photoacid generator. Sulfoniumsalts, bissulfonyldiazomethane, N-sulfonyloxyimide, oxime-O-sulfonatetype photoacid generators are more preferably used as the photoacidgenerator.

Specific examples of the photoacid generator include triphenylsulfoniump-toluenesulfonate, triphenylsulfonium camphorsulfonate,triphenylsulfonium pentafluorobenzenesulfonate, triphenylsulfoniumnonafluorobutanesulfonate, triphenylsulfonium4-(4′-toluenesulfonyloxy)benzenesulfonate,triphenylsulfonium-2,4,6-triisopropylbenzenesulfonate,4-tert-butoxyphenyldiphenylsulfonium p-toluenesulfonate,4-tert-butoxyphenyldiphenylsulfonium camphorsulfonate,4-tert-butoxyphenyldiphenylsulfonium4-(4′-toluenesulfonyloxy)benzenesulfonate, tris(4-methylphenyl)sulfoniumcamphorsulfonate, tris(4-tert-butylphenyl)sulfonium camphorsulfonate,4-tert-butylphenyldiphenylsulfonium camphorsulfonate,4-tert-butylphenyldiphenylsulfonium nonafluoro-l-butanesulfonate,4-tert-butylphenyldiphenylsulfoniumpentafluoroethylperfluorocyclohexanesulfonate,4-tert-butylphenyldiphenylsulfonium perfluoro-1-octanesulfonate,triphenylsulfonium 1,1-difluoro-2-naphthyl-ethanesulfonate,triphenylsulfonium1,1,2,2-tetrafluoro-2-(norbornan-2-yl)ethanesulfonate,bis(tert-butylsulfonyl)diazomethane,bis(cyclohexylsulfonyl)diazomethane,bis(2,4-dimethylphenylsulfonyl)diazomethane,bis(4-n-hexyloxy)phenylsulfonyl)diazomethane,bis(2-methyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(2,5-dimethyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(3,5-dimethyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(2-methyl-5-isopropyl-4-(n-hexyloxy)phenylsulfonyl)diazomethane,bis(4-tert-butylphenylsulfonyl)diazomethane,N-camphorsulfonyloxy-5-norbornene-2,3-dicarboxylic acid imide,N-p-toluenesulfonyloxy-5-norbornene-2,3-dicarboxylic acid imide,2-[2,2,3,3,4,4,5,5-octafluoro-1-(nonafluorobutylsulfonyloxyimino)-pentyl]-fluorene,2-[2,2,3,3,4,4-pentafluoro-1-(nonafluorobutylsulfonyloxyimino)-butyl]-fluorene,and2-[2,2,3,3,4,4,5,5,6,6-decafluoro-1-(nonafluorobutylsulfonyloxyimino)-hexyl]-fluorene.

In the radiation sensitive composition of the present invention, theamount of a photoacid generator added may be arbitrarily set, but is 0.1part by mass to 20 parts by mass, preferably 0.1 part by mass to 10parts by mass with respect to 100 parts by mass of polysiloxanecontained in the radiation sensitive composition. When the amount of thephotoacid generator added is 20 parts by mass or less, a photoresistfilm has a sufficiently high transmittance and accordingly theresolution performance is less likely to deteriorate. Theabove-mentioned photoacid generators may be used singly or incombination of two or more of them. Furthermore, by using a photoacidgenerator having a low transmittance at an exposure wavelength, thetransmittance of the resist film can be controlled with the amount ofthe photoacid generator added.

Furthermore, to the radiation sensitive composition of the presentinvention, a compound (an acid amplifier compound) that is decomposed byan acid and generates an acid may be added.

These compounds are described in J. Photopolym. Sci. and Tech., 8.43-44,45-46 (1995), and J. Photopolym. Sci. and Tech., 9.29-30 (1996).

Examples of the acid amplifier compound include, but are not limited to,tert-butyl 2-methyl 2-tosyloxymethylacetoacetate and 2-phenyl2-(2-tosyloxyethyl) 1,3-dioxolane. Among well-known photoacidgenerators, compounds with inferior stability, especially inferiorthermal stability often have characteristics specific to acid amplifiercompounds.

In the radiation sensitive composition of the present invention, theamount of an acid amplifier compound added is 2 parts by mass or less,preferably 1 part by mass or less with respect to 100 parts by mass ofpolysiloxane contained in the radiation sensitive composition. Forexamples, when the addition amount is 0.0001 part by mass to 2 parts bymass, diffusion is controlled, whereby the deterioration of resolutionand pattern shape are less likely to be caused.

As the organic solvent used in the present invention, any organicsolvent capable of dissolving a base resin (polysiloxane), an acidgenerator, and other additives may be employed. Examples of such anorganic solvent include: ketones, such as cyclohexanone andmethyl-2-n-amyl ketone; alcohols, such as 3-methoxybutanol,3-methyl-3-methoxybutanol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol,and 4-methyl-2-pentanol; ethers, such as propylene glycol monomethylether, ethylene glycol monomethyl ether, propylene glycol monoethylether, propylene glycol monopropyl ether, ethylene glycol monoethylether, propylene glycol dimethyl ether, and diethylene glycol dimethylether; esters, such as propylene glycol monomethyl ether acetate,propylene glycol monoethyl ether acetate, ethyl lactate, ethyl pyruvate,butyl acetate, methyl 3-methoxypropinoate, ethyl 3-ethoxypropionate, andtert-butyl acetate, tert-butyl propionate, and propylene glycolmono-tert-butyl ether acetate; and lactones, such as γ-butyrolactone.These organic solvents may be used singly or in combination of two ormore of them, but not limited to them. In the present invention, amongthese organic solvents, use are preferably made of diethylene glycoldimethyl ether, 1-ethoxy-2-propanol, propylene glycol monomethyl etheracetate, and a mixed solvent thereof, each having the highest solubilityfor an acid generator in resist components.

The amount of the organic solvent used is 200 parts by mass to 3,000parts by mass, preferably 400 parts by mass to 2,500 parts by mass withrespect to 100 parts by mass of the base resin.

Into a resist material of the present invention, one or two or more ofnitrogen-containing organic compounds may be blended as a basic compound(a quencher).

As the nitrogen-containing organic compound, a compound capable ofcontrolling a diffusion rate at which an acid generated by an acidgenerator diffuses into a resist film is suitable. When thenitrogen-containing organic compound is blended into the resistmaterial, the diffusion rate of an acid in the resist film iscontrolled, so that resolution is increased, a change in sensitivityafter exposure is inhibited, dependence on substrates and environmentsis reduced, and, for example, exposure latitude and pattern profiles canbe improved.

Examples of such a nitrogen-containing organic compound (quencher)include primary, secondary, and tertiary aliphatic amines, mixed amines,aromatic amines, heterocyclic amines, nitrogen-containing compoundshaving a carboxy group, nitrogen-containing compounds having a sulfonylgroup, nitrogen-containing compounds having a hydroxy group,nitrogen-containing compounds having a hydroxyphenyl group, alcoholicnitrogen-containing compounds, amides, imides, carbamates, ammonia,ammonium salts, and sulfonium salts.

Such a nitrogen-containing organic compound is expressed by thefollowing general formula.

N(X)_(n)(Y)_(3-n)  (C-1)

In Formula (C-1), n is an integer of 0, 1, 2, or 3. X may be the same ordifferent, and are expressed by Formula (X-1), (X-2), or (X-3). Y arethe same or different, and are each a hydrogen atom, or a linear,branched, or cyclic alkyl group having a carbon atom number of 1 to 20or 1 to 10, and may have an ether group or a hydroxy group. Examples ofthe alkyl group include the above-mentioned examples.

In Formulae (X-1) to (X-3), R²⁰⁰, R²⁰², and R²⁰⁵ are each a linear orbranched alkylene group having a carbon atom number of 1 to 10; and R²⁰¹and R²⁰⁴ are each a hydrogen atom, or a linear, branched, or cyclicalkyl group having a carbon atom number of 1 to 20 or 1 to 10, and mayhave one or a plurality of hydroxy groups, ether groups, ester groups,or lactone rings.

R²⁰³ is a single bond or a linear or branched alkylene group having acarbon atom number of 1 to 10.

R²⁰⁶ is a linear, branched, or cyclic alkyl group having a carbon atomnumber of 1 to 20 or 1 to 10, and may have one or a plurality of hydroxygroups, ether groups, ester groups, or lactone rings.

It should be noted that the alkyl group is as described above, and thealkylene group is a functional group derived from the alkyl group.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formula,having a cyclic structure.

In Formula (C-2), X is as described above; and R²⁰⁷ is a linear orbranched alkylene group having a carbon atom number of 1 to 20, 1 to 10,or 2-20, and may have one or a plurality of carbonyl groups, ethergroups, ester groups, or sulfide groups. The alkylene group is afunctional group derived from the alkyl group, and examples of the alkylgroup include the above-mentioned examples.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formulae,having a cyano group.

In Formulae (C-3) to (C-6), X and R²⁰⁷ are each defined as the same asthose described above; and n is an integer of 1, 2, or 3. R²⁰⁸ and R²⁰⁹are each the same or different, and are each a linear or branchedalkylene group having a carbon atom number of 1 to 10 or 1 to 4.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formula,having an imidazole skeleton.

In Formula (C-7), R²¹⁰ is a linear, branched, or cyclic alkyl grouphaving a carbon atom number of 1 to 20, 1 to 10, or 2-20 having a polarfunctional group, in which the polar functional group is a hydroxygroup, a carbonyl group, an ester group, an ether group, a sulfidegroup, a carbonate group, a cyano group, or an acetal group. R²¹¹, R²¹²,and R²¹³ are each individually a hydrogen atom, a linear, branched, orcyclic alkyl group having a carbon atom number of 1 to 10, an arylgroup, or an aralkyl group.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formula,having a benzimidazole skeleton.

In Formula (C-8), R²¹⁴ is a hydrogen atom, a linear, branched, or cyclicalkyl group having a carbon atom number of 1 to 10, a C₆₋₄₀ aryl group,or an aralkyl group; and R²¹⁵ is a linear, branched, or cyclic alkylgroup having a carbon atom number of 1 to 20 or 1 to 10 having a polarfunctional group. The aralkyl group is composed of a combination of thearyl group and the alkyl group, and examples of the aryl group and thealkyl group include the above-mentioned examples. Examples of the polarfunctional group include the above-mentioned examples.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formulae,having the polar functional group.

In Formulae (C-9) and (C-10), A is a nitrogen atom or ═C—R²²²; B is anitrogen atom or ═C—R²²³; R²¹⁶ is a linear, branched, or cyclic alkylgroup having a carbon atom number of 1 to 20, 1 to 10, or 2-20 having apolar functional group; R²¹⁷, R²¹⁸, R²¹⁹, and R²²⁰ are eachindependently a hydrogen atom, a linear, branched, or cyclic alkyl grouphaving a carbon atom number of 1 to 10, or a C₆₋₄₀ aryl group, and R²¹⁷may be bonded to R²¹⁸, and R²¹⁹ may be bonded to R²²⁰, thereby forming abenzene ring, a naphthalene ring, or a pyridine ring; R²²¹ is a hydrogenatom, a linear, branched, or cyclic alkyl group having a carbon atomnumber of 1 to 10, or an aryl group; R²²² and R²²³ are eachindependently a hydrogen atom, a linear, branched, or cyclic alkyl grouphaving a carbon atom number of 1 to 10, or an aryl group; and R²²¹ maybe bonded to R²²³ to form a benzene ring or a naphthalene ring.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formulae,having an aromatic carboxylic ester structure.

In Formulae (C-11) to (C-14), R²²⁴ is a C₆₋₄₀ aryl group or a C₄₋₂₀heteroaromatic group, and some or all of hydrogen atoms thereof areoptionally substituted with halogen atoms, linear, branched, or cyclicalkyl groups having a carbon atom number of 1 to 10 or 2 to 10, C₆₋₄₀aryl groups, C₇₋₂₀ aralkyl groups, C₁₋₁₀ alkoxy groups, C₁₋₁₀ or C₂₋₁₀acyloxy groups, or C₁₋₁₀ alkylthio groups. R²²⁵ is COOR²²⁶, OR²²⁷, or acyano group. R²²⁶ is a C₁₋₁₀ alkyl group in which some methylene groupsare optionally substituted with oxygen atoms. R²²⁷ is a C₁₋₁₀ alkylgroup in which some methylene groups are optionally substituted withoxygen atoms, or an acyl group. R²²⁸ is a single bond, a methylenegroup, an ethylene group, a sulfur atom, or a —O(CH₂CH₂O)_(n)— group inwhich n is an integer of 0 to 4. R²²⁹ is a hydrogen atom, a methylgroup, an ethyl group, or a phenyl group. X is a nitrogen atom or CR²³⁰.Y is a nitrogen atom or CR²³¹. Z is a nitrogen atom or CR²³². R²³⁰,R²³¹, and R²³² are each independently a hydrogen atom, a methyl group,or a phenyl group; or R²³⁰ may be bonded to R²³¹ or R²³¹ may be bondedto R²³², thereby forming a heteroaromatic ring.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formula,having a 7-oxanorbornane-2-carboxylic ester structure.

In Formula (C-15), R²³³ is a hydrogen atom, or a linear, branched, orcyclic alkyl group having a carbon atom number of 1 to 10. R²³⁴ and R²³⁵are each a C₁₋₂₀ or C₁₋₁₀ alkyl group optionally having a polarfunctional group, a C₆₋₄₀ aryl group, or a C₇₋₂₀ aralkyl group, and someof hydrogen atoms thereof are optionally substituted with halogen atoms.R²³⁴ and R²³⁵ may be bonded to each other to form a C₂₋₂₀ heterocycle ora heteroaromatic ring.

Furthermore, examples of the nitrogen-containing organic compound mayinclude nitrogen-containing organic compounds of the following formula,having a group that leaves under the action of an acid.

In Formula (C-16), R²³⁶ is a hydrogen atom, a C₁₋₁₀ alkyl group, acycloalkyl group, a C₆₋₄₀ aryl group, or an aralkyl group. When n is twoor more, two R²³⁶ may be bonded to each other to form a heterocyclichydrocarbon group. R²³⁷, R²³⁸, and R²³⁹ are each a hydrogen atom, aC₁₋₁₀ alkyl group, a cycloalkyl group, a C₆₋₄₀ aryl group, an aralkylgroup, or an alkoxyalkyl group. n=0 to 2; m=1 to 3; and n+m=3.

Examples of these nitrogen-containing organic compounds may be asfollows.

Examples of the primary aliphatic amines include methylamine,ethylamine, n-propylamine, isopropylamine, n-butylamine, isobutylamine,sec-butylamine, tert-butylamine, pentylamine, tert-amylamine,cyclopentylamine, hexylamine, cyclohexylamine, heptylamine, octylamine,nonylamine, decylamine, dodecylamine, cetylamine, methylenediamine,ethylenediamine, and tetraethylenepentamine.

Examples of the secondary aliphatic amines include dimethylamine,diethylamine, di-n-propylamine, diisopropylamine, di-n-butylamine,diisobutylamine, di-sec-butylamine, dipentylamine, dicyclopentylamine,dihexylamine, dicyclohexylamine, diheptylamine, dioctylamine,dinonylamine, didecylamine, didodecylamine, dicetylamine,N,N-dimethylmethylenediamine, N,N-dimethylethylenediamine, andN,N-dimethyltetraethylenepentamine.

Examples of the tertiary aliphatic amines include trimethylamine,triethylamine, tri-n-propylamine, triisopropylamine, tri-n-butylamine,triisobutylamine, tri-sec-butylamine, tripentylamine,tricyclopentylamine, trihexylamine, tricyclohexylamine, triheptylamine,trioctylamine, trinonylamine, tridecylamine, tridodecylamine,tricetylamine, N,N,N′,N′-tetramethylmethylenediamine,N,N,N′,N′-tetramethylethylenediamine, andN,N,N′,N′-tetramethyltetraethylenepentamine.

Examples of the mixed amines include dimethylethylamine,methylethylpropylamine, benzylamine, phenethylamine, andbenzyldimethylamine.

Specific examples of the aromatic amines and the heterocyclic aminesinclude aniline derivatives (such as aniline, N-methylaniline,N-ethylaniline, N-propylaniline, N,N-dimethylaniline, 2-methylaniline,3-methylaniline, 4-methylaniline, ethylaniline, propylaniline,trimethylaniline, 2-nitroaniline, 3-nitroaniline, 4-nitroaniline,2,4-dinitroaniline, 2,6-dinitroaniline, 3,5-dinitroaniline, andN,N-dimethyltoluidine), diphenyl(p-tolyl)amine, methyldiphenylamine,triphenylamine, phenylenediamine, naphthylamine, diaminonaphthalene,pyrrole derivatives (such as pyrrole, 2H-pyrrole, 1-methylpyrrole,2,4-dimethylpyrrole, 2,5-dimethylpyrrole, and N-methylpyrrole), oxazolederivatives (such as oxazole and isoxazole), thiazole derivatives (suchas thiazole and isothiazole), imidazole derivatives (such as imidazole,4-methylimidazole, and 4-methyl-2-phenylimidazole), pyrazolederivatives, furazan derivatives, pyrroline derivatives (such aspyrroline and 2-methyl-1-pyrroline), pyrrolidine derivatives (such aspyrrolidine, N-methylpyrrolidine, pyrrolidinone, andN-methylpyrrolidone), imidazoline derivatives, imidazolidinederivatives, pyridine derivatives (such as pyridine, methylpyridine,ethylpyridine, propylpyridine, butylpyridine, 4-(1-butylpentyl)pyridine,dimethylpyridine, trimethylpyridine, triethylpyridine, phenylpyridine,3-methyl-2-phenylpyridine, 4-tert-butylpyridine, diphenylpyridine,benzylpyridine, methoxypyridine, butoxypyridine, dimethoxypyridine,4-pyrrolidinopyridine, 2-(1-ethylpropyl)pyridine, aminopyridine, anddimethylaminopyridine), pyridazine derivatives, pyrimidine derivatives,pyrazine derivatives, pyrazoline derivatives, pyrazolidine derivatives,piperidine derivatives, piperazine derivatives, morpholine derivatives,indole derivatives, isoindole derivatives, 1H-indazole derivatives,indoline derivatives, quinoline derivatives (such as quinoline and3-quinolinecarbonitrile), isoquinoline derivatives, cinnolinederivatives, quinazoline derivatives, quinoxaline derivatives,phthalazine derivatives, purine derivatives, pteridine derivatives,carbazole derivatives, phenanthridine derivatives, acridine derivatives,phenazine derivatives, 1,10-phenanthroline derivatives, adeninederivatives, adenosine derivatives, guanine derivatives, guanosinederivatives, uracil derivatives, and uridine derivatives.

Examples of the nitrogen-containing compounds having a carboxy groupinclude aminobenzoic acid, indole carboxylic acid, and amino acidderivatives (such as nicotinic acid, alanine, arginine, aspartic acid,glutamic acid, glycine, histidine, isoleucine, glycyl leucine, leucine,methionine, phenylalanine, threonine, lysine,3-aminopyrazine-2-carboxylic acid, and methoxyalanine).

Examples of the nitrogen-containing compounds having a sulfonyl groupinclude 3-pyridinesulfonic acid and pyridinium p-toluenesulfonate.

Examples of the nitrogen-containing compounds having a hydroxy group,the nitrogen-containing compounds having a hydroxyphenyl group, and thealcoholic nitrogen-containing compounds include 2-hydroxypyridine,aminocresol, 2,4-quinolinediol, 3-indolemethanol hydrate,monoethanolamine, diethanolamine, triethanolamine,N-ethyldiethanolamine, N,N-diethylethanolamine, triisopropanolamine,2,2′-iminodiethanol, 2-aminoethanol, 3-amino-1-propanol,4-amino-1-butanol, 4-(2-hydroxyethyl)morpholine,2-(2-hydroxyethyl)pyridine, 1-(2-hydroxyethyl)piperazine,1-[2-(2-hydroxyethoxy)ethyl]piperazine, piperidineethanol,1-(2-hydroxyethyl)pyrrolidine, 1-(2-hydroxyethyl)-2-pyrrolidinone,3-piperidino-1,2-propanediol, 3-pyrrolidino-1,2-propanediol,8-hydroxyjulolidine, 3-quinuclidinol, 3-tropanol, 1-methyl-2-pyrrolidineethanol, 1-aziridine ethanol, N-(2-hydroxyethyl)phthalimide, andN-(2-hydroxyethyl)isonicotinamide. Examples of the amides includeformamide, N-methylformamide, N,N-dimethylformamide, acetamide,N-methylacetamide, N,N-dimethylacetamide, propionamide, benzamide, and1-cyclohexylpyrrolidone. Examples of the imides include phthalimide,succinimide, and maleimide. Examples of the carbamates includeN-t-butoxycarbonyl-N,N-dicyclohexylamine,N-t-butoxycarbonylbenzimidazole, and oxazolidinone.

Furthermore, use may be made of onium salts, such as a sulfonium salt ofsulfonic acid, nitric acid, or carboxylic acid whose α-position is notfluorinated; an iodonium salt of sulfonic acid, nitric acid, orcarboxylic acid whose α-position is not fluorinated; an ammonium salt ofsulfonic acid, nitric acid, or carboxylic acid whose α-position is notfluorinated; halogenated ammonium; halogenated sulfonium; andhalogenated iodonium. Examples of the carboxylic acid include maleicacid, acetic acid, propionic acid, and formic acid. Examples of thehalogen include fluorine, chlorine, bromine, and iodine, and chlorine ispreferably used.

Specific examples of the sulfonium cation include triphenylsulfonium,4-hydroxyphenyldiphenylsulfonium, bis(4-hydroxyphenyl)phenylsulfonium,tris(4-hydroxyphenyl)sulfonium, (4-tert-butoxyphenyl)diphenylsulfonium,bis(4-tert-butoxyphenyl)phenylsulfonium,tris(4-tert-butoxyphenyl)sulfonium,β-tert-butoxyphenyl)diphenylsulfonium,bis(3-tert-butoxyphenyl)phenylsulfonium,tris(3-tert-butoxyphenyl)sulfonium,(3,4-di-tert-butoxyphenyl)diphenylsulfonium,bis(3,4-di-tert-butoxyphenyl)phenylsulfonium,tris(3,4-di-tert-butoxyphenyl)sulfonium, diphenyl(4-thiophenoxyphenyl)sulfonium, (4-tert-butoxycarbonylmethyloxyphenyl)diphenylsulfonium,tris(4-tert-butoxycarbonylmethyloxyphenyl)sulfonium,(4-tert-butoxyphenyl)bis(4-dimethylaminophenyl)sulfonium,tris(4-dimethylaminophenyl)sulfonium, 2-naphthyldiphenylsulfonium,dimethyl-2-naphthylsulfonium, 4-hydroxyphenyldimethylsulfonium,4-methoxyphenyldimethylsulfonium, trimethylsulfonium,2-oxocyclohexylcyclohexylmethylsulfonium, trinaphthylsulfonium,tribenzylsulfonium, diphenylmethylsulfonium, dimethylphenylsulfonium,2-oxo-2-phenylethylthiacyclopentanium, diphenyl 2-thienylsulfonium,4-n-butoxynaphthyl-1-thiacyclopentanium,2-n-butoxynaphthyl-1-thiacyclopentanium,4-methoxynaphthyl-1-thiacyclopentanium, and2-methoxynaphthyl-1-thiacyclopentanium. More preferred examples thereofinclude triphenylsulfonium, 4-tert-butylphenyldiphenylsulfonium,4-tert-butoxyphenyldiphenylsulfonium, tris(4-tert-butylphenyl)sulfonium,and (4-tert-butoxycarbonylmethyloxyphenyl)diphenylsulfonium.

Further examples of the sulfonium cation include4-(methacryloyloxy)phenyldiphenylsulfonium,4-(acryloyloxy)phenyldiphenylsulfonium,4-(methacryloyloxy)phenyldimethylsulfonium, and4-(acryloyloxy)phenyldimethylsulfonium.

Examples of the ammonium cation include: ammonium cations formed byproton addition to nitrogen atoms of, for example, ammonia, primary,secondary, and tertiary aliphatic amines, mixed amines, aromatic amines,heterocyclic amines, nitrogen-containing compounds having a carboxygroup, nitrogen-containing compounds having a sulfonyl group,nitrogen-containing compounds having a hydroxy group,nitrogen-containing compounds having a hydroxyphenyl group, andalcoholic nitrogen-containing compounds; and quaternary ammoniumcations. Examples of the quaternary ammonium cations includetetraethylammonium and benzyltriethylammonium.

The radiation sensitive composition of the present invention may containa crosslinking agent.

Examples of the crosslinking agent include melamine-based crosslinkingagents, substituted-urea-based crosslinking agents, and polymer-basedcrosslinking agents thereof. A crosslinking agent having at least twocrosslinkage-forming substituents is preferably used, and examples ofsuch a crosslinking agent include compounds, such as methoxymethylatedglycoluril, butoxymethylated glycoluril, methoxymethylated melamine,butoxymethylated melamine, methoxymethylated benzoguanamine,butoxymethylated benzoguanamine, methoxymethylated urea,butoxymethylated urea, methoxymethylated thiourea, and methoxymethylatedthiourea. Furthermore, condensation products of these compounds may alsobe used.

Furthermore, as the above-mentioned crosslinking agent, a crosslinkingagent having high heat resistance may be used. As the crosslinking agenthaving high heat resistance, a compound containing acrosslinkage-forming substituent having an aromatic ring (such as abenzene ring or a naphthalene ring) in its molecule may be preferablyused.

Examples of such a compound include a compound having a partialstructure of Formula (5) below and a polymer or oligomer having arepeating unit of Formula (6) below.

In Formula (5), R¹¹⁰ and R¹¹¹ are each independently a hydrogen atom, aC₁₋₁₀ alkyl group, or a C₆₋₂₀ aryl group; n10 is an integer of 1 to 4;n11 is an integer of 1 to (5−n10); and (n10+n11) is an integer of 2 to5.

In Formula (6), R¹¹² is a hydrogen atom or a C₁₋₁₀ alkyl group; R¹¹³ isa C₁₋₁₀ alkyl group; n12 is an integer of 1 to 4; n13 is an integer of 0to (4−n12); and (n12+n13) is an integer of 1 to 4. The oligomer and thepolymer may be each used when having 2 to 100, or 2 to 50 repeating-unitstructures.

Examples of these alkyl and aryl groups include the above-mentionedalkyl and aryl groups.

Examples of the compounds of Formula (5) and the polymer and theoligomer of Formula (6) are as follows.

The above-mentioned compounds are available as products of ASAHI YUKIZAICORPORATION and Honshu Chemical Industry Co., Ltd. For example, amongthe above-mentioned crosslinking agents, the compound of Formula (4-21)is available as a compound trade-named TM-BIP-A, manufactured by ASAHIYUKIZAI CORPORATION.

For example, among the above-mentioned crosslinking agents, the compoundof Formula (4-22) is available as a compound trade-named TMOM-BP,manufactured by Honshu Chemical Industry Co., Ltd.

Although the amount of the crosslinking agent added varies depending onan application solvent to be used, a base substrate to be used, arequired solution viscosity, a required film shape, and the like, thecrosslinking agent may be used at a proportion of 0.001% by mass to 80%by mass, preferably 0.01% by mass to 50% by mass, more preferably 0.05%by mass to 40% by mass with respect to the total solid content. Thesecrosslinking agents are sometimes self-condensed to cause a crosslinkingreaction, but, in the case where a crosslinkable substituent is presentin the above-mentioned polymers of the present invention, thecrosslinking agents can cause a crosslinking reaction with thecrosslinkable substituent.

The radiation sensitive composition of the present invention can be usedas a resist composition in a lithography process.

According to the present invention, the resolution of the radiationsensitive composition including a siloxane polymer having a phenoplastcrosslinking reactivity as a base resin and further including aphotoacid generator and a solvent can be increased. The phenoplastreactive group of the composition of the present invention contains amethylol or a protected methylol group, and addition of the reactivegroup to a portion with an abundance of electrons of an aromatic ring inthe polymer allows the composition to be cured at low temperature, andthus, a good negative pattern can be obtained.

In the formula above, EDG is an electron donating group, such as hydroxygroup, methoxy group, or methyl group. It is deemed that, due to an acidfrom a PAG (a photoacid generator), a methoxy group leaves a methoxymethyl group with which a phenyl group is substituted, and the resultantreacts with the ortho position or para position with respect to theposition of the EDG with which a phenyl group is substituted, and thus,a crosslinking reaction based on a phenoplast reaction is caused.Depending on the presence of a reactive site at the ortho or paraposition with respect to the position of the EDG or a relative increasein electron density at the ortho or para position in the case where aplurality of EDGs are present, it is determined how easily anelectrophilic substitution reaction proceeds. Furthermore, ease ofreaction causes curing at lower temperature and curing with a smalleramount of exposure, and therefore leads to acid diffusion inhibition andhigher sensitivity.

The present invention provides, as a radiation sensitive resin, apolysiloxane-based radiation sensitive resin that is excellent insensitivity and resolution, the resin including polysiloxane as itsskeleton and having, in its side chain, a functional group capable ofundergoing a phenoplast reaction making use of a crosslinking structureformed by the reaction of a protected methylol group and phenolichydroxy group.

A resist film can be obtained by baking the radiation sensitivecomposition of the present invention, and a resist pattern can beobtained by exposing the resist film to light and developing. Thepolysiloxane-based radiation sensitive resin is preferable because theresist pattern obtained therefrom has high resistance to oxygen-basedplasma etching, and accordingly, an organic underlayer film (organichard mask) that is an underlayer of the resist, and a substrate can beeasily processed. However, since conventional negative resists mainlyallow pattern formation by means of silanol condensation or radicalpolymerization, sufficient patterning characteristics cannot be achievedbecause of curing of a non-exposed portion due to the instability ofsilanol, inhibition of a radical reaction by oxygen, and lowsensitivity. The radiation sensitive composition of the presentinvention includes polysiloxane as its skeleton, and furthermore, thecomposition is a siloxane material having a phenoplast-based functionalgroup in a polymer, and therefore, can be easily cured and have highersensitivity.

Furthermore, a multi-process is performed, in which, for the purpose ofpreventing the collapse of a finer pattern of a resist film formed froma resist material at the time of development, the film thickness of theresist film is made smaller, and an underlayer film having gas etchingresistance different from that of the resist material is provideddirectly under the resist film.

In other words, lithography is performed using a process in which, usinga dry etching gas to which a resist material has resistance and which iscapable of removing an underlayer film disposed directly under theresist, a resist pattern is transferred to the underlayer film, andthen, using a dry etching gas to which the underlayer film hasresistance and which is capable of removing and processing a film and asubstrate disposed directly under the underlayer film, the pattern issequentially transferred to the layer and the substrate.

Examples of this include the provision of a laminated structure inwhich, under an organic resist, a silicon-based hard mask is disposed,and furthermore, under the silicon-based hard mask, an organic hard maskand a substrate are disposed in this order.

Alternatively, in the case of using a silicon-based resist, there isprovided a laminated structure in which, under the silicon-based resist,an organic hard mask and a substrate are disposed in this order.

The radiation sensitive resin of the present invention is apolysiloxane-based radiation sensitive resin that is excellent insensitivity and resolution, the resin including polysiloxane as itsskeleton and having, in its side chain, a functional group capable ofundergoing a phenoplast reaction making use of a crosslinking structureformed by the reaction of a methylol group and a phenolic hydroxy group,and hence, the radiation sensitive resin provides a resist patternhaving gas etching resistance and has higher lithographycharacteristics.

Specifically, the present invention includes a method for forming aresist pattern, the method comprising the steps of: applying theabove-described radiation sensitive composition of the present inventiononto a semiconductor substrate and baking the composition to form aresist film; exposing the resist film to light; and after the exposure,developing the resist film to form a resist pattern.

Furthermore, according to the present invention, a semiconductor devicecan be produced using a method comprising the steps of: applying theabove-described radiation sensitive composition onto a semiconductorsubstrate and baking the composition to form a resist film; exposing theresist film to light; after the exposure, developing the resist film toform a resist pattern; and processing the substrate using the resistpattern.

Onto a substrate used for producing a semiconductor device (such as asilicon wafer substrate, a silicon/silicon-dioxide coated substrate, asilicon nitride substrate, a glass substrate, an ITO substrate, apolyimide substrate, or a low dielectric constant material (low-kmaterial) coated substrate), the radiation sensitive composition of thepresent invention is applied by appropriate application means, such as aspinner or a coater, and subsequently baked to form a resist film. Theconditions for the baking are appropriately selected from heatingtemperatures of 80° C. to 250° C. and heating durations of 0.3 minute to60 minutes. The baking temperature is preferably 150° C. to 250° C., andthe heating duration is preferably 0.5 minute to 2 minutes. Thethickness of the resist film formed herein is, for example, 50 nm to10,000 nm, 100 nm to 2,000 nm, or 200 nm to 1,000 nm.

Next, exposure is performed through a predetermined mask. For theexposure, for example, a KrF excimer laser (with a wavelength of 248nm), an ArF excimer laser (with a wavelength of 193 nm), or an F2excimer laser (with a wavelength of 157 nm) may be used. After theexposure, post exposure bake may be performed, if necessary. The postexposure bake is performed under the conditions appropriately selectedfrom heating temperatures of 70° C. to 150° C. and heating durations of0.3 minute to 10 minutes.

Next, the resist film is developed using a developing solution (forexample, an alkaline developing solution). Through this development, anon-exposed portion of the negative resist film formed from thecomposition of the present invention is removed to form a resistpattern.

Examples of the developing solution include alkaline solutions, such as:aqueous solutions of alkali metal hydroxides, such as potassiumhydroxide and sodium hydroxide; aqueous solutions of quaternary ammoniumhydroxides, such as tetramethyl ammonium hydroxide, tetraethyl ammoniumhydroxide, and choline; and aqueous solutions of amines, such asethanolamine, propylamine, and ethylenediamine. Furthermore, forexample, a surfactant may be added to the developing solution. Thedevelopment conditions are appropriately selected from temperatures of5° C. to 50° C. and durations of 10 seconds to 600 seconds.

Furthermore, in the present invention, an organic solvent may be used asthe developing solution. After the exposure, development is performedusing the developing solution (solvent). Through the development, anon-exposed resist portion of the negative resist film formed from thecomposition of the present invention is removed to form a photoresistpattern.

Examples of the developing solution include methyl acetate, butylacetate, ethyl acetate, isopropyl acetate, amyl acetate, isoamylacetate, ethyl methoxyacetate, ethyl ethoxyacetate, propylene glycolmonomethyl ether acetate, ethylene glycol monoethyl ether acetate,ethylene glycol monopropyl ether acetate, ethylene glycol monobutylether acetate, ethylene glycol monophenyl ether acetate, diethyleneglycol monomethyl ether acetate, diethylene glycol monopropyl etheracetate, diethylene glycol monoethyl ether acetate, diethylene glycolmonophenyl ether acetate, diethylene glycol monobutyl ether acetate,diethylene glycol monoethyl ether acetate, 2-methoxy butyl acetate,3-methoxybutyl acetate, 4-methoxybutyl acetate, 3-methyl-3-methoxybutylacetate, 3-ethyl-3-methoxybutyl acetate, propylene glycol monomethylether acetate, propylene glycol monoethyl ether acetate, propyleneglycol monopropyl ether acetate, 2-ethoxy butyl acetate, 4-ethoxy butylacetate, 4-propoxy butyl acetate, 2-methoxy pentyl acetate, 3-methoxypentyl acetate, 4-methoxy pentyl acetate, 2-methyl-3-methoxy pentylacetate, 3-methyl-3-methoxy pentyl acetate, 3-methyl-4-methoxy pentylacetate, 4-methyl-4-methoxy pentyl acetate, propylene glycol diacetate,methyl formate, ethyl formate, butyl formate, propyl formate, ethyllactate, butyl lactate, propyl lactate, ethyl carbonate, propylcarbonate, butyl carbonate, methyl pyruvate, ethyl pyruvate, propylpyruvate, butyl pyruvate, methyl acetoacetate, ethyl acetoacetate,methyl propionate, ethyl propionate, propyl propionate, isopropylpropionate, methyl 2-hydroxypropionate, ethyl 2-hydroxypropionate,methyl-3-methoxy propionate, ethyl-3-methoxy propionate, ethyl-3-ethoxypropionate, and propyl-3-methoxy propionate. Furthermore, for example, asurfactant may be added to the developing solution. The developmentconditions are appropriately selected from temperatures of 5° C. to 50°C. and durations of 10 seconds to 600 seconds.

Furthermore, the present invention includes a method for producing asemiconductor device, the method comprising the steps of: forming anorganic underlayer film on a semiconductor substrate; applying theradiation sensitive composition of the present invention onto theorganic underlayer film and baking the composition to form a resistfilm; exposing the resist film to light; after the exposure, developingthe resist film to obtain a resist pattern; etching the organicunderlayer film using the resist pattern; and processing thesemiconductor substrate using the patterned organic underlayer film.

More specifically, an organic underlayer film is film-formed on asubstrate, and then the organic underlayer film is coated with a resist,that is, the radiation sensitive composition of the present invention.The use of the radiation sensitive composition of the present inventionallows the substrate to be processed using an appropriately selectedetching gas, even when the pattern width of a resist film is narrowerand accordingly the resist is applied thinly for the purpose ofpreventing pattern collapse. For example, the use of an oxygen-based gasas an etching gas, which offers a sufficiently higher etching rate forthe organic underlayer film than that for the resist, allows the organicunderlayer film to be processed. Furthermore, the use of afluorine-based gas as an etching gas, which offers a sufficiently higheretching rate for the substrate than that for the organic underlayerfilm, allows the substrate to be processed.

For the dry etching of the resist film according to the presentinvention, use may be made of gases, such as tetrafluoromethane (CF₄),parfluorocyclobutane (C₄F₈), parfluoropropane (C₃F₈), trifluoromethane,carbon monoxide, argon, oxygen, nitrogen, sulfur hexafluoride,difluoromethane, nitrogen trifluoride and chlorine trifluoride,chlorine, trichloroborane, and dichloroborane.

The dry etching of the organic underlayer film (underlayer) ispreferably performed using an oxygen-based gas. This is because theresist film formed of the radiation sensitive composition of the presentinvention that contains many silicon atoms is difficult to remove by dryetching using an oxygen-based gas.

Subsequently, the semiconductor substrate is processed. The processingof the semiconductor substrate is preferably performed by dry etchingusing a fluorine-based gas.

Examples of the fluorine-based gas include tetrafluoromethane (CF₄),parfluorocyclobutane (C₄F₈), parfluoropropane (C₃F₈), trifluoromethane,and difluoromethane (CH₂F₂).

The present invention further relates to, among the compounds of Formula(2), a novel silane compound of Formula (5-1), Formula (5-2), or Formula(5-3). In the formulae, R¹⁷, R¹⁹, R²¹, R²², and R²³ are eachindependently an alkyl group; and R¹⁶, R¹⁸, and R²⁰ are eachindependently an alkoxy group, an acyloxy group, or a halogen group.Here, examples of the alkyl group include C₁₋₁₀ alkyl groups, andspecific examples thereof include the above-mentioned examples.Likewise, examples of the alkoxy group include C₁₋₂₀ alkoxy groups, andexamples of the acyloxy group include C₁₋₂₀ or C₂₋₂₀ acyloxy groups, andfurthermore, examples of these alkoxy and acyloxy groups and the halogengroup include the above-mentioned examples.

EXAMPLES Synthesis of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane

Into a 300-ml eggplant flask equipped with a magnetic stirrer, 42.0 g of4-bromophenol, 94.6 g of tetrahydrofuran (hereinafter, sometimesreferred to as THF) (dehydrated), and 1.83 g of pyridiniump-toluenesulfonate (hereinafter, sometimes referred to as PPTS) wereintroduced and dissolved. To the resultant solution, 26.26 g of ethylvinyl ether was added, and the resultant solution was allowed to reactat room temperature for 20 hours. The resultant solution was neutralizedusing 0.74 g of triethylamine (hereinafter, sometimes referred to asTEA) to prepare Reaction Solution A. Into a 500-ml three-neck flaskequipped with a stirrer chip, 7.08 g of dried magnesium powder, 0.62 gof iodine, and 189.2 g of tetrahydrofuran (dehydrated) were introduced,and the mixture was heated in an oil bath at 60° C. until the color ofthe iodine disappeared. Subsequently, the resultant solution was cooledto room temperature, and Reaction Solution A was added dropwise theretoat room temperature and the resultant solution was allowed to react for2 hours to obtain Reaction Solution B. Into a 1,000-ml three-neck flaskequipped with a stirrer chip, 110.86 g of tetramethoxysilane(hereinafter, sometimes referred to as TMOS) and 189.2 g oftetrahydrofuran (dehydrated) were introduced, and stirred. To theresultant solution, Reaction Solution B was added dropwise at roomtemperature, and the resultant solution was allowed to react for 2hours. The obtained solution was concentrated by evaporation, and then,500 ml of a heptane solution was added thereto, followed by stirring andfiltration. The obtained filtrate was concentrated, and then purified bydistillation under reduced pressure to obtain 27 g of(4-(1-ethoxyethoxy)phenyl)trimethoxysilane as a target product.

¹H-NMR (500 MHz, DMSO-d₆): 1.06 ppm (t, 3H), 1.37 ppm (d, 3H), 3.48 ppm(s, 9H), 3.55 ppm (multi, 2H), 5.49 ppm (q, 1H), 7.01 (d, 2H), 7.45 ppm(d, 2H)

Synthesis of β-(1-ethoxyethoxy)phenyl)trimethoxysilane

Into a 300-ml eggplant flask equipped with a magnetic stirrer, 42.0 g of3-bromophenol, 94.6 g of tetrahydrofuran (dehydrated), and 1.83 g ofpyridinium p-toluenesulfonate were introduced and dissolved. To theresultant solution, 26.26 g of ethyl vinyl ether was added, and theresultant solution was allowed to react at room temperature for 20hours. The resultant solution was neutralized using 0.74 g oftriethylamine to prepare Reaction Solution A. Into a 500-ml three-neckflask equipped with a stirrer chip, 7.08 g of dried magnesium powder,0.62 g of iodine, and 189.2 g of tetrahydrofuran (dehydrated) wereintroduced, and heated in an oil bath at 60° C. until the color of theiodine disappeared. Subsequently, the resultant solution was cooled toroom temperature, and Reaction Solution A was added dropwise thereto atroom temperature and the resultant solution was allowed to react for 2hours to obtain Reaction Solution B. Into a 1,000-ml three-neck flaskequipped with a stirrer chip, 110.86 g of tetramethoxysilane and 189.2 gof tetrahydrofuran (dehydrated) were introduced, and stirred. To theresultant solution, Reaction Solution B was added dropwise at roomtemperature, and the resultant solution was allowed to react for 2hours. The obtained solution was concentrated by evaporation, and then,500 ml of a heptane solution was added thereto, followed by stirring andfiltration. The obtained filtrate was concentrated, and then purified bydistillation under reduced pressure to obtain 30 g of Compound 2 as atarget product.

¹H-NMR (500 MHz, DMSO-d₆): 1.10 ppm (t, 3H), 1.40 ppm (d, 3H), 3.54 ppm(s, 9H), 3.59 ppm (multi, 2H), 5.47 ppm (q, 1H), 7.15 ppm (multi, 3H),7.36 ppm (t, 1H)

Synthesis of (2-(1-ethoxyethoxy)phenyl)trimethoxysilane

Into a 300-ml eggplant flask equipped with a magnetic stirrer, 42.0 g of2-bromophenol, 94.6 g of tetrahydrofuran (dehydrated), and 1.83 g ofpyridinium p-toluenesulfonate were introduced and dissolved. To theresultant solution, 26.26 g of ethyl vinyl ether was added, and theresultant solution was allowed to react at room temperature for 20hours. The resultant solution was neutralized using 0.74 g oftriethylamine to prepare Reaction Solution A. Into a 500-ml three-neckflask equipped with a stirrer chip, 7.08 g of dried magnesium powder,0.62 g of iodine, and 189.2 g of tetrahydrofuran (dehydrated) wereintroduced, and heated in an oil bath at 60° C. until the color of theiodine disappeared. Subsequently, the resultant solution was cooled toroom temperature, and Reaction Solution A was added dropwise thereto atroom temperature and the resultant solution was allowed to react for 2hours to obtain Reaction Solution B. Into a 1,000-ml three-neck flaskequipped with a stirrer chip, 110.86 g of tetramethoxysilane and 189.2 gof tetrahydrofuran (dehydrated) were introduced, and stirred. To theresultant solution, Reaction Solution B was added dropwise at roomtemperature, and the resultant solution was allowed to react for 2hours. The obtained solution was concentrated by evaporation, and then,500 ml of a heptane solution was added thereto, followed by stirring andfiltration. The obtained filtrate was concentrated, and then purified bydistillation under reduced pressure to obtain 25 g of Compound 3 as atarget product.

¹H-NMR (500 MHz, DMSO-d₆): 1.12 ppm (t, 3H), 1.43 ppm (d, 3H), 3.53 ppm(s, 9H), 3.60 ppm (multi, 2H), 5.57 ppm (q, 1H), 6.98 (t, 1H), 7.10 ppm(d, 1H), 7.42 ppm (t, 1H), 7.50 ppm (d, 1H)

Synthesis of (4-(1-ethoxyethoxy)-2,6-dimethylphenyl)trimethoxysilane

Into a 300-ml eggplant flask equipped with a magnetic stirrer, 42.0 g of4-bromo-3,5-dimethylphenol, 94.6 g of tetrahydrofuran (dehydrated), and1.57 g of pyridinium p-toluenesulfonate were introduced and dissolved.To the resultant solution, 22.59 g of ethyl vinyl ether was added, andthe resultant solution was allowed to react at room temperature for 20hours. The resultant solution was neutralized using 0.63 g oftriethylamine to prepare Reaction Solution A. Into a 500-ml three-neckflask equipped with a stirrer chip, 6.09 g of dried magnesium powder,0.53 g of iodine, and 189.2 g of tetrahydrofuran (dehydrated) wereintroduced, and heated in an oil bath at 60° C. until the color of theiodine disappeared. Subsequently, the resultant solution was cooled toroom temperature, and Reaction Solution A was added dropwise thereto atroom temperature, and the resultant solution was allowed to react for 2hours to obtain Reaction Solution B. Into a 1,000-ml three-neck flaskequipped with a stirrer chip, 95.39 g of tetramethoxysilane and 189.2 gof tetrahydrofuran (dehydrated) were introduced, and stirred. To theresultant solution, Reaction Solution B was added dropwise at roomtemperature, and the resultant solution was allowed to react for 2hours. The obtained solution was concentrated by evaporation, and then,500 ml of a heptane solution was added thereto, followed by stirring andfiltration. The obtained filtrate was concentrated, and then purified bydistillation under reduced pressure to obtain 35 g of Compound 4 as atarget product.

¹H-NMR (500 MHz, DMSO-d₆): 1.06 ppm (t, 3H), 1.34 ppm (d, 3H), 2.36 ppm(s, 6H), 3.47 ppm (s, 9H), 3.53 ppm (multi, 2H), 5.46 ppm (q, 1H), 6.61(s, 2H)

Synthesis of Phenoplast Crosslinkable Silane

Into a 1,000-ml eggplant flask equipped with a magnetic stirrer, 20.0 gof vanillyl alcohol and 400.0 g of methanol were introduced anddissolved. To the resultant solution, 0.25 g of concentrated sulfuricacid was added, and the resultant solution was heated to reflux for 1hour. The resultant solution was cooled to room temperature, andneutralized using sodium hydroxide, and subsequently, methanol wasremoved therefrom by evaporation. The resultant solution was transferredinto a 300-ml three-neck flask, and 5.19 g of sodium hydroxide, 40 g oftoluene, and 40 g of NMP (N-methylpyrrolidone) were added thereto, andthe resultant solution was allowed to react in an oil bath at 130° C.for 4 hours while water and the toluene were removed. To the resultantsolution, 27.60 g of chloromethyltriethoxysilane was added dropwise, andthe resultant solution was heated and stirred at 130° C. for 4 hours.The obtained solution was cooled to room temperature, and transferredinto a separating funnel, and 120 g of toluene and 90 g of water wereadded thereto to wash an organic layer. After the washing was repeated 3times, magnesium sulfate was added to the organic layer and dried,followed by filtration, and the solvent was removed by evaporation toobtain an intermediate product. The intermediate product was thenpurified by distillation under reduced pressure to obtain 15 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane as a targetproduct.

¹H-NMR (500 MHz, DMSO-d₆): 1.20 ppm (t, 9H), 3.26 ppm (s, 3H), 3.68 ppm(s, 2H), 3.75 ppm (s, 3H), 3.87 ppm (q, 6H), 4.32 (s, 2H), 6.83 ppm (d,1H), 6.89 ppm (s, 1H), 7.00 ppm (d, 2H)

Synthesis Example 1

(Polymerization Reaction)

Into a 100-ml reaction flask, 4.90 g of a 35%-by-mass tetraethylammonium hydroxide solution (hereinafter, sometimes referred to asTEAOH), 26.01 g of isopropanol (hereinafter, sometimes referred to asIPA), and 26.01 g of tetrahydrofuran were introduced, and stirred. Tothe resultant solution, 10.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (50 mol % ofall the silanes) and 8.31 g of β-(1-ethoxyethoxy)phenyl)trimethoxysilane(50 mol % of all the silanes) were added at room temperature, and theresultant solution was heated to 40° C. and allowed to react for 4hours. The resultant solution was cooled to room temperature, and 109.88g of ethyl acetate and 54.94 g of water were added thereto, and theresultant solution was neutralized using a 0.2N hydrochloric acidsolution. The neutralized solution was transferred into a separatingfunnel, and washed 3 times with water, and then, to an organic layer,propylene glycol monomethyl ether acetate (hereinafter, sometimesreferred to as PGMEA) was added and the organic layer was concentratedto perform solvent substitution. The obtained polymer had a solidcontent of 40.20% by weight.

(Deprotection Reaction)

Into a 100-ml reaction flask, 25 g of the obtained polymer solution wastransferred, and 10.18 g of propylene glycol monomethyl ether and 25.13g of acetone were added thereto, and furthermore, 2.41 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 39.11% by weightand the polymer had a molecular weight of 1,850.

Synthesis Example 2

(Polymerization Reaction)

Into a 100-ml reaction flask, 4.90 g of a 35%-by-mass tetraethylammonium hydroxide solution, 26.01 g of isopropanol, and 26.01 g oftetrahydrofuran were introduced, and stirred. To the resultant solution,10.00 g of (2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (50mol % of all the silanes) and 8.31 g of(2-(1-ethoxyethoxy)phenyl)trimethoxysilane (50 mol % of all the silanes)were added at room temperature, and the resultant solution was heated to40° C. and allowed to react for 4 hours. The resultant solution wascooled to room temperature, and 109.88 g of ethyl acetate and 54.94 g ofwater were added thereto, and the resultant solution was neutralizedusing a 0.2N hydrochloric acid solution. The neutralized solution wastransferred into a separating funnel, and washed 3 times with water, andthen, to an organic layer, propylene glycol monomethyl ether acetate wasadded and the organic layer was concentrated to perform solventsubstitution. The obtained polymer had a solid content of 33.54% byweight.

(Deprotection Reaction)

Into a 100-ml reaction flask, 30 g of the obtained polymer solution wastransferred, and 5.22 g of propylene glycol monomethyl ether and 25.16 gof acetone were added thereto, and furthermore, 2.41 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 35.43% by weightand the polymer had a molecular weight of 1,500.

Synthesis Example 3

(Polymerization Reaction)

Into a 100-ml reaction flask, 0.25 g of a 35%-by-mass tetraethylammonium hydroxide solution, 0.777 g of ultrapure water, 7.33 g ofisopropanol, and 4.02 g of tetrahydrofuran were introduced, and stirred.To the resultant solution, 5.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (50 mol % ofall the silanes) and 4.57 g of(4-(1-ethoxyethoxy)-2,6-dimethylphenyl)trimethoxysilane (50 mol % of allthe silanes) were added at room temperature, and the resultant solutionwas heated to 40° C. and allowed to react for 4 hours. The resultantsolution was cooled to room temperature, and 57.38 g of ethyl acetateand 28.69 g of water were added thereto, and the resultant solution wasneutralized using a 0.1N acetic acid solution. The neutralized solutionwas transferred into a separating funnel, and washed 3 times with water,and then, to an organic layer, propylene glycol monomethyl ether acetatewas added and the organic layer was concentrated to perform solventsubstitution. The obtained polymer had a solid content of 59.03% byweight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 8 g of the obtained polymer solution wastransferred, and 8.53 g of propylene glycol monomethyl ether and 11.81 gof acetone were added thereto, and furthermore, 1.07 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 36.56% by weightand the polymer had a molecular weight of 2,000.

Synthesis Example 4

(Polymerization Reaction)

Into a 100-ml reaction flask, 1.63 g of a 35%-by-mass tetraethylammonium hydroxide solution, 8.68 g of isopropanol, and 8.68 g oftetrahydrofuran were introduced, and stirred. To the resultant solution,3.00 g of (2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (45mol % of all the silanes), 2.49 g of(4-(1-ethoxyethoxy)phenyl)trimethoxysilane (45 mol % of all thesilanes), and 0.62 g of 1,4-bis(trimethoxysilyl)benzene (10 mol % of allthe silanes) were added, and heated to 40° C. and the resultant solutionwas allowed to react for 4 hours. The resultant solution was cooled toroom temperature, and 36.66 g of ethyl acetate and 18.33 g of water wereadded thereto, and the resultant solution was neutralized using a 0.2Nhydrochloric acid solution. The neutralized solution was transferredinto a separating funnel, and washed 3 times with water, and then, to anorganic layer, propylene glycol monomethyl ether acetate was added andthe organic layer was concentrated to perform solvent substitution. Theobtained polymer had a solid content of 51.65% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 5 g of the obtained polymer solution wastransferred, and 4.04 g of propylene glycol monomethyl ether and 6.46 gof acetone were added thereto, and furthermore, 0.62 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 32.74% by weightand the polymer had a molecular weight of 5,300.

Synthesis Example 5

(Polymerization Reaction)

Into a 100-ml reaction flask, 1.63 g of a 35%-by-mass tetraethylammonium hydroxide solution, 9.02 g of isopropanol, and 9.02 g oftetrahydrofuran were introduced, and stirred. To the resultant mixture,3.00 g of (2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (45mol % of all the silanes), 2.74 g of(4-(1-ethoxyethoxy)-2,6-dimethylphenyl)trimethoxysilane (45 mol % of allthe silanes), and 0.62 g of 1,4-bis(trimethoxysilyl)benzene (10 mol % ofall the silanes) were added at room temperature, and the resultantsolution was heated to 40° C. and allowed to react for 4 hours. Theresultant solution was cooled to room temperature, and 36.66 g of ethylacetate and 18.33 g of water were added thereto, and the resultantsolution was neutralized using a 0.2N hydrochloric acid solution. Theneutralized solution was transferred into a separating funnel, andwashed 3 times with water, and then, to an organic layer, propyleneglycol monomethyl ether acetate was added and the organic layer wasconcentrated to perform solvent substitution. The obtained polymer had asolid content of 41.97% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 8 g of the obtained polymer solution wastransferred, and 3.75 g of propylene glycol monomethyl ether and 8.39 gof acetone were added thereto, and furthermore, 0.81 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 25.37% by weightand the polymer had a molecular weight of 3,700.

Synthesis Example 6

(Polymerization Reaction)

Into a 100-ml reaction flask, 1.63 g of a 35%-by-mass tetraethylammonium hydroxide solution, 8.93 g of isopropanol, and 8.93 g oftetrahydrofuran were introduced, and stirred. To the resultant solution,3.00 g of (2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (45mol % of all the silanes), 2.49 g of(4-(1-ethoxyethoxy)phenyl)trimethoxysilane (45 mol % of all thesilanes), and 0.79 g of 1,4-bis(dimethoxy(phenyl)silyl)benzene (10 mol %of all the silanes) were added at room temperature, and the resultantsolution was heated to 40° C. and allowed to react for 4 hours. Theresultant solution was cooled to room temperature, and 36.66 g of ethylacetate and 18.33 g of water were added thereto, and the resultantsolution was neutralized using a 0.2N hydrochloric acid solution. Theneutralized solution was transferred into a separating funnel, andwashed 3 times with water, and then, to an organic layer, propyleneglycol monomethyl ether acetate was added and the organic layer wasconcentrated to perform solvent substitution. The obtained polymer had asolid content of 54.47% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 5 g of the obtained polymer solution wastransferred, and 4.53 g of propylene glycol monomethyl ether and 6.81 gof acetone were added thereto, and furthermore, 0.65 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 32.85% by weightand the polymer had a molecular weight of 3,300.

Synthesis Example 7

(Polymerization Reaction)

Into a 100-ml reaction flask, 2.72 g of a 35%-by-mass tetraethylammonium hydroxide solution, 14.17 g of isopropanol, and 14.17 g oftetrahydrofuran were introduced, and heated to 40° C. with stirring. Tothe resultant solution, 5.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (45 mol % ofall the silanes), 4.16 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(45 mol % of all the silanes), and 0.82 g of1-(trimethoxysilyl)-2-(dimethoxymethylsilyl)ethane (10 mol % of all thesilanes) were added, and the resultant solution was allowed to react for4 hours. The resultant solution was cooled to room temperature, and59.87 g of ethyl acetate was added thereto, and the resultant solutionwas neutralized using a 0.2N hydrochloric acid solution. The neutralizedsolution was transferred into a separating funnel, and washed 3 timeswith water, and then, to an organic layer, propylene glycol monomethylether acetate was added and the organic layer was concentrated toperform solvent substitution.

The obtained polymer had a solid content of 30.53% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 15 g of the obtained polymer solution wastransferred, and 1.03 g of propylene glycol monomethyl ether and 11.45 gof acetone were added thereto, and furthermore, 1.15 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 35.15% by weightand the polymer had a molecular weight of 2,800.

Synthesis Example 8

(Polymerization Reaction)

Into a 100-ml reaction flask, 4.90 g of a 35%-by-mass tetraethylammonium hydroxide solution, 21.51 g of isopropanol, and 21.51 g oftetrahydrofuran were introduced, and heated to 40° C. with stirring. Tothe resultant solution, 5.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (25 mol % ofall the silanes), 4.16 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(25 mol % of all the silanes), 1.85 g of 1,4-bis(trimethoxysilyl)benzene(10 mol % of all the silanes), and 4.14 g of methyltriethoxysilane (40mol % of all the silanes) were added, and the resultant solution wasallowed to react for 4 hours. The resultant solution was cooled to roomtemperature, and 90.88 g of ethyl acetate was added thereto, and theresultant solution was neutralized using a 0.2N hydrochloric acidsolution. The neutralized solution was transferred into a separatingfunnel, and washed 3 times with water, and then, to an organic layer,propylene glycol monomethyl ether acetate was added and the organiclayer was concentrated to perform solvent substitution. The obtainedpolymer had a solid content of 35.31% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 15 g of the obtained polymer solution wastransferred, and 3.544 g of propylene glycol monomethyl ether and 13.24g of acetone were added thereto, and furthermore, 1.82 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 35.53% by weightand the polymer had a molecular weight of 7,100.

Synthesis Example 9

(Polymerization Reaction)

Into a 100-ml reaction flask, 4.90 g of a 35%-by-mass tetraethylammonium hydroxide solution, 26.01 g of isopropanol, and 26.01 g oftetrahydrofuran were introduced, and stirred. To the resultant solution,10.00 g of (2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (50mol % of all the silanes) and 8.31 g of(4-(1-ethoxyethoxy)phenyl)trimethoxysilane (50 mol % of all the silanes)were added at room temperature, and the resultant solution was heated to40° C. and allowed to react for 4 hours. The resultant solution wascooled to room temperature, and 109.88 g of ethyl acetate and 54.94 g ofwater were added thereto, and the resultant solution was neutralizedusing a 0.2N hydrochloric acid solution. The neutralized solution wastransferred into a separating funnel, and washed 3 times with water, andthen, to an organic layer, propylene glycol monomethyl ether acetate wasadded and the organic layer was concentrated to perform solventsubstitution. The obtained polymer had a solid content of 44.52% byweight.

(Deprotection Reaction)

Into a 100-ml reaction flask, 25 g of the obtained polymer solution wastransferred, and 13.96 g of propylene glycol monomethyl ether and 27.83g of acetone were added thereto, and furthermore, 2.67 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 40.45% by weightand the polymer had a molecular weight of 2,100.

Synthesis Example 10

(Polymerization Reaction)

Into a 100-ml reaction flask, 2.94 g of a 35%-by-mass tetraethylammonium solution, 12.67 g of isopropanol, and 12.67 g oftetrahydrofuran were introduced, and heated to 40° C. with stirring. Tothe resultant solution, 3.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (25 mol % ofall the silanes), 2.49 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(25 mol % of all the silanes), 0.94 g of bistrimethoxysilylethane (10mol % of all the silanes), and 2.48 g of methyltriethoxysilane (40 mol %of all the silanes) were added, and the resultant solution was allowedto react for 4 hours. The resultant solution was cooled to roomtemperature, and 53.42 g of ethyl acetate was added thereto, and theresultant solution was neutralized using a 0.2N hydrochloric acidsolution. The neutralized solution was transferred into a separatingfunnel, and washed 3 times with water, and then, to an organic layer,propylene glycol monomethyl ether acetate was added and the organiclayer was concentrated to perform solvent substitution. The obtainedpolymer had a solid content of 34.42% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 12 g of the obtained polymer solution wastransferred, and 3.834 g of propylene glycol monomethyl ether acetateand 11.70 g of acetone were added thereto, and furthermore, 1.51 g of a0.01M hydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 30.13% by weightand the polymer had a molecular weight of 4,000.

Synthesis Example 11

(Polymerization Reaction)

Into a 100-ml reaction flask, 2.94 g of a 35%-by-mass tetraethylammonium solution, 12.67 g of isopropanol, and 12.67 g oftetrahydrofuran were introduced, and heated to 40° C. with stirring. Tothe resultant solution, 3.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (25 mol % ofall the silanes), 2.49 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(25 mol % of all the silanes), 0.73 g of tetraethoxysilane (10 mol % ofall the silanes), and 2.48 g of methyltriethoxysilane (40 mol % of allthe silanes) were added, and the resultant solution was allowed to reactfor 4 hours. The resultant solution was cooled to room temperature, and52.23 g of ethyl acetate was added thereto, and the resultant solutionwas neutralized using a 0.2N hydrochloric acid solution. The neutralizedsolution was transferred into a separating funnel, and washed 3 timeswith water, and then, to an organic layer, propylene glycol monomethylether acetate was added and the organic layer was concentrated toperform solvent substitution. The obtained polymer had a solid contentof 30.72% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 12 g of the obtained polymer solution wastransferred, and 2.134 g of propylene glycol monomethyl ether acetateand 10.44 g of acetone were added thereto, and furthermore, 1.37 g of a0.01M hydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 33.63% by weightand the polymer had a molecular weight of 2,200.

Synthesis Example 12

(Polymerization Reaction)

Into a 300-ml reaction flask, 0.98 g of a 35%-by-mass tetraethylammonium solution, 6.28 g of water, 23.49 g of isopropanol, and 46.98 gof methylisobutylketone were introduced, and heated to 40° C. withstirring. To the resultant solution, 10.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (25 mol % ofall the silanes), 8.31 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(25 mol % of all the silanes), 7.15 g of2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane (25 mol % of all thesilanes), and 5.18 g of methyltriethoxysilane (25 mol % of all thesilanes) were added, and the resultant solution was allowed to react for4 hours. To the resultant solution, 140.94 g of methylisobutylketone wasadded, and furthermore, 23.33 g of a 1.0M nitric acid solution was addedthereto, and the resultant solution was allowed to react for 4 hours.The resultant solution was transferred into a separating funnel, andwashed 3 times with water, and then, to an organic layer, propyleneglycol monomethyl ether was added and the organic layer was concentratedto perform solvent substitution. The obtained polymer had a solidcontent of 42.24% by weight and a molecular weight of 5,800. By epoxyvalue titration, it was confirmed that there was no remaining-epoxy. Theepoxy value was measured in accordance with JIS K-7236.

Synthesis Example 13

(Polymerization Reaction)

Into a 100-ml reaction flask, 1.63 g of a 35%-by-mass tetraethylammonium solution, 8.93 g of isopropanol, and 8.93 g of tetrahydrofuranwere introduced, and heated to 40° C. with stirring. To the resultantsolution, 3.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (45 mol % ofall the silanes), 2.67 g oftriethoxy(3-((tetrahydro-2H-pyran-2-yl)oxy)propyl)silane (45 mol % ofall the silanes), and 0.62 g of 1,4-bis(trimethoxysilyl)benzene (10 mol% of all the silanes) were added, and the resultant solution was allowedto react for 4 hours. The resultant solution was cooled to roomtemperature, and 37.71 g of ethyl acetate was added thereto, and theresultant solution was neutralized using a 0.2N hydrochloric acidsolution. The neutralized solution was transferred into a separatingfunnel, and washed 3 times with water, and then, to an organic layer,propylene glycol monomethyl ether acetate was added and the organiclayer was concentrated to perform solvent substitution. The obtainedpolymer had a solid content of 31.20% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 9 g of the obtained polymer solution wastransferred, and 0.83 g of propylene glycol monomethyl ether acetate and7.02 g of acetone were added thereto, and furthermore, 0.67 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 24.31% by weightand the polymer had a molecular weight of 4,700.

Synthesis Example 14

(Polymerization Reaction)

Into a 100-ml reaction flask, 2.94 g of a 35%-by-mass tetraethylammonium solution, 13.01 g of isopropanol, and 13.01 g oftetrahydrofuran were introduced, and heated to 40° C. with stirring. Tothe resultant solution, 3.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (25 mol % ofall the silanes), 2.49 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(25 mol % of all the silanes), 1.11 g of 1,4-bis(trimethoxysilyl)benzene(10 mol % of all the silanes), 2.42 g of methyltriethoxysilane (39 mol %of all the silanes), and 0.14 g of4-methoxy-N-β-(triethoxysilyl)propyl)benzenesulfonamide (1 mol % of allthe silanes) were added, and the resultant solution was allowed to reactfor 4 hours. The resultant solution was cooled to room temperature, and54.97 g of ethyl acetate was added thereto, and the resultant solutionwas neutralized using a 0.2N hydrochloric acid solution. The neutralizedsolution was transferred into a separating funnel, and washed 3 timeswith water, and then, to an organic layer, propylene glycol monomethylether acetate was added and the organic layer was concentrated toperform solvent substitution. The obtained polymer had a solid contentof 26.60% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 12 g of the obtained polymer solution wastransferred, and 0.24 g of propylene glycol monomethyl ether acetate and9.04 g of acetone were added thereto, and furthermore, 1.14 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 41.03% by weightand the polymer had a molecular weight of 6,900.

Synthesis Example 15

(Polymerization Reaction)

Into a 100-ml reaction flask, 2.94 g of a 35%-by-mass tetraethylammonium solution, 13.00 g of isopropanol, and 13.00 g oftetrahydrofuran were introduced, and heated to 40° C. with stirring. Tothe resultant solution, 3.00 g of(2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (25 mol % ofall the silanes), 2.49 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane(25 mol % of all the silanes), 1.11 g of 1,4-bis(trimethoxysilyl)benzene(10 mol % of all the silanes), 2.42 g of methyltriethoxysilane (39 mol %of all the silanes), and 0.13 g oftriethoxy(3-((4-methoxyphenyl)sulfonyl)propyl)silane (1 mol % of all thesilanes) were added, and the resultant solution was allowed to react for4 hours. The resultant solution was cooled to room temperature, and54.97 g of ethyl acetate was added thereto, and the resultant solutionwas neutralized using a 0.2N hydrochloric acid solution. The neutralizedsolution was transferred into a separating funnel, and washed 3 timeswith water, and then, to an organic layer, propylene glycol monomethylether acetate was added and the organic layer was concentrated toperform solvent substitution. The obtained polymer had a solid contentof 29.35% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 12 g of the obtained polymer solution wastransferred, and 1.50 g of propylene glycol monomethyl ether acetate and9.98 g of acetone were added thereto, and furthermore, 1.26 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the solution was concentrated to obtain a polymer solution. Thepolymer solution had a solid content concentration of 34.77% by weightand the polymer had a molecular weight of 6,900.

Synthesis Example 16

(Polymerization Reaction)

Into a 100-ml reaction flask, 1.03 g of a 35%-by-mass tetraethylammonium solution, 4.15 g of isopropanol, and 4.15 g of tetrahydrofuranwere introduced, and heated to 40° C. with stirring. To the resultantsolution, 1.00 g of triethoxy((4-(ethoxymethyl)phenoxy)methyl)silane (25mol % of all the silanes), 0.87 g of(4-(1-ethoxyethoxy)phenyl)trimethoxysilane (25 mol % of all thesilanes), 0.39 g of 1,4-bis(trimethoxysilyl)benzene (10 mol % of all thesilanes), and 0.66 g of methyltriethoxysilane (40 mol % of all thesilanes) were added, and the resultant solution was allowed to react for4 hours. The resultant solution was cooled to room temperature, and17.54 g of ethyl acetate was added thereto, and the resultant solutionwas neutralized using a 0.2N hydrochloric acid solution. The neutralizedsolution was transferred into a separating funnel, and washed 3 timeswith water, and then, to an organic layer, propylene glycol monomethylether acetate was added and the organic layer was concentrated toperform solvent substitution. The obtained polymer had a solid contentof 24.24% by weight.

(Deprotection Reaction)

Into a 50-ml reaction flask, 5 g of the obtained polymer solution wastransferred, and 3.03 g of acetone was added thereto, and furthermore,0.47 g of a 0.01M hydrochloric acid solution was added dropwise theretoat room temperature, and the resultant solution was allowed to reactunder reflux for 4 hours. Subsequently, by evaporation, acetone,hydrochloric acid, water, and by-products were removed from the obtainedsolution, and the solution was concentrated to obtain a polymersolution. The polymer solution had a solid content concentration of25.98% by weight and the polymer had a molecular weight of 7,100.

Synthesis Example 17

The same operation as in Synthesis Example 8 was conducted, except thatall of the propylene glycol monomethyl ether acetate and the propyleneglycol monomethyl ether in Synthesis Example 8 were changed to butylacetate. The polymer solution had a solid content concentration of38.69% by weight and the polymer had a molecular weight of 7,200.

Synthesis Example 18

The same operation as in Synthesis Example 8 was conducted, except thatall of the propylene glycol monomethyl ether acetate and the propyleneglycol monomethyl ether in Synthesis Example 8 were changed tomethylisobutylcarbinol. The polymer solution had a solid contentconcentration of 35.69% by weight and the polymer had a molecular weightof 6,900.

Comparative Synthesis Example 1

(Polymerization Reaction)

Into a 100-ml reaction flask, 8.52 g of a 35%-by-mass tetraethylammonium hydroxide solution, 34.71 g of isopropanol, and 34.71 g oftetrahydrofuran were introduced, and stirred. To the resultant solution,10.00 g of phenyltrimethoxysilane (50 mol % of all the silanes) and14.44 g of (4-(1-ethoxyethoxy)phenyl)trimethoxysilane (50 mol % of allthe silanes) were added at room temperature, and the resultant solutionwas heated to 40° C. and allowed to react for 4 hours. The resultantsolution was cooled to room temperature, and 146.66 g of ethyl acetateand 73.33 g of water were added thereto, and the resultant solution wasneutralized using a 0.2N hydrochloric acid solution. The neutralizedsolution was transferred into a separating funnel, and washed 3 timeswith water, and then, to an organic layer, propylene glycol monomethylether acetate was added and the organic layer was concentrated toperform solvent substitution. The obtained polymer had a solid contentof 38.77% by weight.

(Deprotection Reaction)

Into a 100-ml reaction flask, 35 g of the obtained polymer solution wastransferred, and 12.49 g of propylene glycol monomethyl ether and 33.92g of acetone were added thereto, and furthermore, 4.23 g of a 0.01Mhydrochloric acid solution was added dropwise thereto at roomtemperature, and the resultant solution was allowed to react underreflux for 4 hours. Subsequently, by evaporation, acetone, hydrochloricacid, water, and by-products were removed from the obtained solution,and the resultant solution was concentrated to obtain a polymersolution. The polymer solution had a solid content concentration of40.80% by weight and the polymer had a molecular weight of 1,500.

Comparative Synthesis Example 2

(Polymerization Reaction)

Into a 100-ml reaction flask, 4.26 g of a 35%-by-mass tetraethylammonium hydroxide solution, 19.43 g of isopropanol, and 19.43 g oftetrahydrofuran were introduced, and stirred. To the resultant solution,10.00 g of phenyltrimethoxysilane (50 mol % of all the silanes) and 8.69g of (2-methoxy-4-(methoxymethyl)phenoxy)methyltriethoxysilane (50 mol %of all the silanes) were added at room temperature, and the resultantsolution was heated to 40° C. and allowed to react for 4 hours. Theresultant solution was cooled to room temperature, and 82.12 g of ethylacetate and 41.06 g of water were added thereto, and the resultantsolution was neutralized using a 0.2N hydrochloric acid solution. Theneutralized solution was transferred into a separating funnel, andwashed 3 times with water, and then, to an organic layer, propyleneglycol monomethyl ether acetate was added and the organic layer wasconcentrated to perform solvent substitution. The obtained polymer had asolid content of 41.15% by weight and a molecular weight of 1,800.

(Preparation of Radiation Sensitive Composition)

Each of the polysiloxanes obtained in Synthesis Examples 1 to 18 andComparative Synthesis Examples 1 to 2 was mixed with a photoacidgenerator, a quencher, an additive, and a solvent so as to achieve acorresponding to one of ratios shown in Table 1, and each of theresultant mixtures was filtered with a 0.02 μm fluororesin filter,whereby a solution of a radiation sensitive composition was prepared.The ratio of each of the polymers in Table 1 refers not to the mass of asolution of the polymer, but to the mass of the polymer itself.

TABLE 1 Photoacid Crosslinking Polymer Generator Quencher Agent SolventExample 1 Synthesis PAG-1 PGME PGMEA Example 1 (part by mass) 6 0.18 5050 Example 2 Synthesis PAG-1 PGME PGMEA Example 2 (part by mass) 6 0.1850 50 Example 3 Synthesis PAG-2 TEA PGME PGMEA Example 3 (part by mass)6 0.15 0.011 50 50 Example 4 Synthesis PAG-2 TEA PGME PGMEA Example 4(part by mass) 6 0.18 0.013 50 50 Example 5 Synthesis PAG-4 TEA PGMEPGMEA Example 4 (part by mass) 6 0.17 0.022 50 50 Example 6 SynthesisPAG-3 TPSMA PGME PGMEA Example 4 (part by mass) 6 0.17 0.055 50 50Example 7 Synthesis PAG-3 TEA PGME PGMEA Example 5 (part by mass) 6 0.170.022 50 50 Example 8 Synthesis PAG-3 TPSNO3 PGME PGMEA Example 5 (partby mass) 6 0.17 0.024 50 50 Example 9 Synthesis PAG-2 TEA PGME PGMEAExample 6 (part by mass) 6 0.18 0.013 50 50 Example 10 Synthesis PAG-2BTEAC PGME PGMEA Example 3 (part by mass) 6 0.15 0.017 50 50 Example 11Synthesis PAG-5 TEA PGME PGMEA Example 5 (part by mass) 6 0.17 0.011 5050 Example 12 Synthesis PAG-3 TPSMA PGME PGMEA Example 7 (part by mass)6 0.17 0.055 50 50 Example 13 Synthesis PAG-3 TPSMA PGME PGMEA Example 8(part by mass) 6 0.17 0.055 50 50 Example 14 Synthesis PAG-3 TEA TMOM-BPPGME PGMEA Example 5 (part by mass) 6 0.17 0.022 0.3 50 50 Example 15Synthesis PAG-3 TEA PWL1174 PGME PGMEA Example 5 (part by mass) 6 0.170.022 0.3 50 50

TABLE 2 Photoacid Crosslinking Polymer Generator Quencher Agent SolventExample 16 Synthesis PAG-3 TPSMA PGME PGMEA Example 10 (part by mass) 60.17 0.055 50 50 Example 17 Synthesis PAG-3 TPSMA PGME PGMEA Example 11(part by mass) 6 0.17 0.055 50 50 Example 18 Synthesis PAG-6 TEA PGMEPGMEA Example 4 (part by mass) 20  0.60 0.053 90 10 Example 19 SynthesisPAG-7 TEA PGME PGMEA Example 12 (part by mass) 20  0.40 0.057 90 10Example 20 Synthesis PAG-4 TEA AcOBu Example 17 (part by mass) 6 0.180.019 100 Example 21 Synthesis PAG-3 TPSMA PGME PGMEA Example 14 (partby mass) 6 0.17 0.055 50 50 Example 22 Synthesis PAG-3 TPSMA PGME PGMEAExample 15 (part by mass) 6 0.17 0.055 50 50 Example 23 Synthesis PAG-3TPSMA PGME PGMEA Example 16 (part by mass) 6 0.17 0.055 50 50 Example 24Synthesis PAG-4 TEA MIBC Example 18 (part by mass) 6 0.18 0.019 100Example 25 Synthesis PAG-3 TEA PGME PGMEA Example 13 (part by mass) 60.17 0.022 50 50 Comparative Comparative PAG-1 PGME PGMEA Example 1Synthesis Example 1 (part by mass) 6 0.18 50 50 Comparative ComparativePAG-1 PGME PGMEA Example 2 Synthesis Example 2 (part by mass) 6 0.18 5050 Comparative Comparative PAG-1 TMOM-BP PGME PGMEA Example 3 SynthesisExample 1 (part by mass) 6 0.18 6 50 50

Abbreviations in Table 1 and Table 2 mean as follows.

PAG-1: diphenyl(4-(phenylthio)phenyl)sulfonium hexafluorophosphate

PAG-2: triphenylsulfonium 3-hydroxypropane-1-sulfonate

PAG-3: triphenylsulfonium 1,1,2-trifluoro-4-hydroxybutane-1-sulfonate

PAG-4: triphenylsulfonium perfluorobutanesulfonate

PAG-5: triphenylsulfonium 4-(2-hydroxyethyl))benzenesulfonate

PAG-6: a compound of the following formula

PAG-7: a compound of the following formula

TEA: triethanolamine

TPSMA: triphenylsulfonium maleate

TPSNO3: triphenylsulfonium nitrate

BTEAC: benzyl triethyl ammonium chloride

Trade name TMOM-BP: (manufactured by Honshu Chemical Industry Co., Ltd.,3,3′,5,5′-tetramethoxymethyl-4,4′-dihydroxybiphenyl) Formula (4-22)

Trade name PWL1174: tetramethoxymethylglycoluril

PGME: propylene glycol monomethyl ether

PGMEA: propylene glycol monomethyl ether acetate

AcOBu: butyl acetate

MIBC: methyl isobutyl carbinol

(Preparation of Organic Underlayer Film-1-Forming Composition)

In 302.0 g of propylene glycol monomethyl ether, 40.0 g of a compound ofFormula (6-1) (trade name: EHPE3150, manufactured by Daicel ChemicalIndustries, Ltd.), 20.3 g of 9-anthracene carboxylic acid, and 13.7 g ofbenzoic acid were dissolved, and subsequently, 1.5 g ofbenzyltriethylammonium was added thereto, and the resultant solution wasallowed to react under reflux for 24 hours. The solution resulting fromthe reaction was purified by ion exchange to obtain a solution of a highmolecular compound of Formula (6-2). A GPC analysis of the obtained highmolecular compound showed that the compound had a weight-averagemolecular weight Mw of 4,100 in terms of standard polystyrene. To obtaina solution, 5 g of the obtained high polymer solution (the polymer had asolid content of 16% by mass) was mixed with 0.2 g oftetramethoxymethylglycoluril, 0.03 g of pyridinium p-toluenesulfonate,0.0008 g of a fluorine-based surfactant MEGAFAC R-30N (trade name,manufactured by DIC Corporation), 6.4 g of propylene glycol monomethylether, and 4.5 g of propylene glycol monomethyl ether acetate. Theresultant solution was then filtered with a polyethylene microfilterhaving a pore size of 0.10 μm, and further filtered with a polyethylenemicrofilter having a pore size of 0.05 μm to prepare a solution of anorganic underlayer film-1-forming composition to be used for alithography process using a multilayer film.

(Preparation of Organic Underlayer Film-2-Forming Composition)

First, 51.76 g of trade name KAYAHARD GPH-103 (biphenyl aralkyl typephenol resin, manufactured by Nippon Kayaku Co., Ltd.) was mixed with8.02 g of tetramethoxymethylglycoluril (trade name: POWDERLINK[registered trademark] 1174, manufactured by Nihon Cytec IndustriesInc.), 0.16 g of a thermal acid generator TAG-2689 (trade name,manufactured by King Industries, Inc., U.S., containing a quarternaryammonium salt of trifluoromethanesulfonic acid as a component) as acatalyst, and 0.052 g of MEGAFAC [registered trademark] R-40(manufactured by DIC Corporation) as a surfactant. The resultant mixturewas dissolved in 54.00 g of propylene glycol monomethyl ether acetateand 126.0 g of propylene glycol monomethyl ether to obtain a solution.The resultant solution was then filtered with a polyethylene microfilterhaving a pore size of 0.10 μm, and further filtered with a polyethylenemicrofilter having a pore size of 0.05 μm to prepare a solution of anorganic underlayer film-2-forming composition.

(Measurements of Dry Etching Rate)

For measurements of dry etching rate, the following etcher and etchinggas were used.

RIE-10NR (manufactured by SAMCO INC.): O₂

Each of the solutions of the radiation sensitive compositions preparedin Examples 1 to 17, 20 to 24 and Comparative Examples 1 to 3 wasapplied onto a silicon wafer using a spinner. The composition on thewafer was heated on a hot plate at 110° C. for 1 minute to form aradiation sensitive resin film having a film thickness of 0.12 μm.Furthermore, likewise, a coating of an organic underlayer film wasformed on a silicon wafer using a spinner (with heating at 240° C. for 1minute to achieve a film thickness of 0.30 μm).

Using O₂ gas as an etching gas, the dry etching rates of the films weremeasured, and comparisons among the dry etching rates of the radiationsensitive resin films of Examples 1 to 17 and Comparative Examples 1 to3 and the organic underlayer film were made. Etching selectivity ratiowas determined by dividing the dry etching rate of the radiationsensitive resin film by the dry etching rate of the organic underlayerfilm.

[Developability Evaluation]

Each of the radiation sensitive compositions prepared in Examples 1 to17, 20 to 24 and Comparative Examples 1 to 3 was applied onto a siliconwafer using a spinner. The composition on the wafer was then heated on ahot plate at 110° C. for 1 minute to form a radiation sensitive resinfilm (having a film thickness of 0.12 μm). Next, using NSR-S205C, a lensscanning-type stepper manufactured by NIKON CORPORATION (with awavelength of 248 nm, NA: 0.75, a: 0.85 (CONVENTIONAL)), the radiationsensitive resin film was exposed to light through an open mask of 1-cmsquare, with varying the amount of exposure from 0 mJ to 100 mJ.Subsequently, the resulting film was “post-exposure baked” on a hotplate at a predetermined temperature, 110° C., for 1 minute. After beingcooled, the film was developed using a 2.38% tetramethylammoniumhydroxide solution as a developing solution. A case in which, owing toan increase in the amount of exposure, a curing reaction proceeded toform a film was evaluated as 0. A case in which a curing reaction didnot proceed or a film remained at 0 mJ was evaluated as x.

[Lithography Evaluation (Optimum Exposure Amount, Shape Evaluation)]

The organic underlayer film-1-forming composition was applied onto asilicon wafer, and baked on a hot plate at 240° C. for 60 seconds toobtain an organic underlayer film 1 having a film thickness of 215 nm.Onto the organic underlayer film 1, each of the radiation sensitivecompositions prepared in Examples 1 to 17, 20 to 24 and ComparativeExamples 1 to 3 was applied using a spinner. Subsequently, thecomposition on the organic underlayer film was baked on a hot plate at apredetermined temperature for 1 minute to form a radiation sensitiveresin film (having a film thickness of 0.12 μm). Next, using NSR-S205C,a lens scanning-type stepper manufactured by NIKON CORPORATION (with awavelength of 248 nm, NA: 0.75, a: 0.85 (CONVENTIONAL)), the resultingfilm was exposed to light through a mask set so as to achieve a linewidth and a line spacing of 0.16 μm. Subsequently, the resulting filmwas “post-exposure baked” on a hot plate at a predetermined temperaturefor 1 minute. After being cooled, the resultant film was developed usinga 2.38% tetramethylammonium hydroxide solution as a developing solution.The amount of exposure required for achieving a line width of 0.16 μmand a line-to-space ratio of 1:1 was taken as an optimum exposureamount. Here, for the measurements of line width, a scanning electronmicroscope (“CG-4100”, manufactured by Hitachi High-TechnologiesCorporation) was used. Furthermore, for the sectional shape of apattern, observations of the sectional shape of the formedline-and-space pattern having a line width of 160 nm were conducted. Forthe observation of the sectional shape, “S-4800”, manufactured byHitachi High-Technologies Corporation was used.

In Table 3, S. B stands for film formation temperature, and PEB standsfor post-exposure bake temperature (the same applies to Table 4 to Table6). Furthermore, as for the shapes illustrated in the sectional views ofresist patterns in FIGS. 1A to 1C, the shape of a) is expressed in theterm “undercut”; the shape of b) is expressed in the term “straight”;and the shape of c) is expressed in the term “tapered”. Furthermore, theterm “not cured” represents a state in which, after exposure anddevelopment, a film is not formed, and a pattern is not obtained,accordingly; and the term “not dissolved” represents a state in which afilm is not dissolved in a developing solution, remains even at 0 mJ,and is not photosensitive, and accordingly, a pattern is not obtained.

TABLE 3 Optimum Etching Developability Exposure Selectivity S.B/PEBEvaluation Amount Shape Ratio Example 1 110° C./110° C. ◯ 25 mJ straight0.06 Example 2 110° C./110° C. ◯ 17 mJ tapered 0.06 Example 3 110°C./110° C. ◯ 21 mJ straight 0.06 Example 4 110° C./110° C. ◯ 24 mJstraight 0.05 Example 5 80° C./80° C. ◯ 22 mJ straight 0.05 Example 680° C./80° C. ◯ 22 mJ straight 0.05 Example 7 80° C./80° C. ◯ 29 mJstraight 0.05 Example 8 80° C./80° C. ◯ 20 mJ straight 0.05 Example 9110° C./110° C. ◯ 18 mJ straight 0.06 Example 10 110° C./110° C. ◯ 21 mJstraight 0.06 Example 11 110° C./110° C. ◯ 11 mJ straight 0.05 Example12 80° C./80° C. ◯ 25 mJ straight 0.05 Example 13 80° C./80° C. ◯ 30 mJstraight 0.04 Example 14 80° C./80° C. ◯ 28 mJ straight 0.06 Example 1580° C./80° C. ◯ 29 mJ straight 0.06 Example 16 80° C./80° C. ◯ 40 mJstraight 0.03 Example 17 80° C./80° C. ◯ 60 mJ straight 0.04 Example 2080° C./80° C. ◯ 44 mJ straight 0.03 Example 21 80° C./80° C. ◯ 33 mJstraight 0.03 Example 22 80° C./80° C. ◯ 33 mJ straight 0.03 Example 2380° C./80° C. ◯ 64 mJ straight 0.03 Example 24 80° C./80° C. ◯ 46 mJstraight 0.03 Comparative 110° C./110° C. ◯ — not cured 0.04 Example 1Comparative 110° C./110° C. X — not 0.05 Example 2 dissolved Comparative110° C./110° C. ◯ — not cured — Example 3 Organic 240° C. X — — 1.00Underlayer Film 1

[Evaluation of Lithography for Solvent Development Process]

The organic underlayer film-1-forming composition was applied onto asilicon wafer, and baked on a hot plate at 240° C. for 60 seconds toobtain an organic underlayer film 1 having a film thickness of 215 nm.Onto the organic underlayer film 1, each of the radiation sensitivecompositions prepared in Examples 20 and 24 was applied using a spinner.Subsequently, the composition of the film was baked on a hot plate at80° C. for 1 minute to form a radiation sensitive resin film (having afilm thickness of 0.12 μm). Next, using NSR-S205C, a lens scanning-typestepper manufactured by NIKON CORPORATION (with a wavelength of 248 nm,NA: 0.75, a: 0.85 (CONVENTIONAL)), the film was exposed to light througha mask set so as to achieve a line width and a line spacing of 0.18 μm.Subsequently, the resultant film was “post-exposure baked” on a hotplate at 80° C. for 1 minute. After being cooled, the film was developedusing butyl acetate as a developing solution. The amount of exposurerequired for achieving a line width of 0.18 μm and a line-to-space ratioof 1:1 was taken as an optimum exposure amount. Here, for themeasurements of line width, a scanning electron microscope (“CG-4100”,manufactured by Hitachi High-Technologies Corporation) was used.Furthermore, for the sectional shape of a pattern, observations of thesectional shape of the formed line-and-space pattern having a line widthof 180 nm were conducted. For the observation of the sectional shape,“S-4800”, manufactured by Hitachi High-Technologies Corporation wasused.

TABLE 4 Optimum Exposure S.B/PEB Amount Shape Example 20 80° C./80° C.23 mJ straight Example 24 80° C./80° C. 24 mJ slight footing

[Lithography Evaluation using i-Line Aligner]

To a silicon wafer, 1,1,1,3,3,3-hexamethyldisilazane treatment was givenat 90° C. for 60 seconds, and the radiation sensitive compositionprepared in Example 18 was applied onto the wafer using a spinner.Subsequently, the composition on the wafer was baked on a hot plate at80° C. for 1 minute to form a radiation sensitive resin film (having afilm thickness of 1.0 μm). Next, the film was exposed using a maskaligner, 8-inch automatic exposure apparatus AE810e, manufactured byNANOTEC CORPORATION and equipped with a multi-lamp, USH-250BY,manufactured by USHIO INC. The exposure was performed through a mask setso as to achieve a line width and a line spacing of 2.0 μm.Subsequently, the resultant film was “post-exposure baked” on a hotplate at 80° C. for 1 minute. After being cooled, the film was developedusing a 2.38% tetramethylammonium hydroxide solution as a developingsolution. The amount of exposure required for achieving a line width of2.0 μm and a line-to-space ratio of 1:1 was taken as an optimum exposureamount. Here, for the measurements of line width, a scanning electronmicroscope (“CG-4100”, manufactured by Hitachi High-TechnologiesCorporation) was used. Furthermore, for the sectional shape of apattern, observations of the sectional shape of the formedline-and-space pattern having a line width of 2.0 μm were conducted(FIG. 2 ). For the observation of the sectional shape, “S-4800”,manufactured by Hitachi High-Technologies Corporation was used.

[Evaluation of Heat-Resistance of Pattern]

The patterned film obtained using an i-line aligner was heated on a hotplate at 230° C. for 30 minutes under air, and the line width and shapeof the pattern were observed (FIG. 3 ). For the observation, “S-4800”,manufactured by Hitachi High-Technologies Corporation was used. As aresult of the measurements, a case in which the shrinkages of patternline width and film thickness were each 5% or less was evaluated asgood.

TABLE 5 Optimum Exposure Heat-resistance S.B/PEB Amount Shape of PatternExample 18 80° C./80° C. 360 mJ straight good

[Lithography Evaluation Using i-Line Stepper]

The organic underlayer film-2-forming composition was applied onto asilicon wafer, and baked on a hot plate at 240° C. for 1 minute to forman organic underlayer film 2 having a film thickness of 2 Onto theorganic underlayer film 2, the radiation sensitive composition preparedin Example 19 was applied using a spinner. Subsequently, the compositionon the film was baked on a hot plate at 80° C. for 1 minute to form aradiation sensitive resin film (having a film thickness of 1.0 μm).Next, using NSR-2205i12D (i-line stepper), manufactured by NIKONCORPORATION, the film was exposed to light through a mask set so as toachieve a line width and a line spacing of 0.30 The exposure was carriedout through a mask set so as to achieve a line width and a line spacingof 0.3 μm. Subsequently, the resultant film was “post-exposure baked” ona hot plate at 80° C. for 1 minute. After being cooled, the film wasdeveloped using a 2.38% tetramethylammonium hydroxide solution as adeveloping solution. The amount of exposure required for achieving aline width of 0.3 μm and a line-to-space ratio of 1:1 was taken as anoptimum exposure amount. Here, for the measurements of line width, ascanning electron microscope (“CG-4100”, manufactured by HitachiHigh-Technologies Corporation) was used. Furthermore, for the sectionalshape of a pattern, observations of the sectional shape of the formedline-and-space pattern having a line width of 0.3 μm were conducted. Forthe observation of the sectional shape, “S-4800”, manufactured byHitachi High-Technologies Corporation was used.

TABLE 6 Optimum Exposure S.B/PEB Amount Shape Example 19 80° C./80° C.180 mJ straight

(Measurements of Exposure Sensitivity)

When the electron density of the aromatic ring of phenol is high, curingreactivity is high, and the reactivity becomes higher depending on therelationship of a substitution position between Si and phenol and thesubstitution of an electron donating group. For example, to eachpolysiloxane of Synthesis Examples 1, 2, and 3 and Synthesis Example 9,3% by mass of a photoacid generator (PAG-1) was added with respect tothe solid, and the mixture was diluted with a solvent having acomposition of propylene glycol monomethyl ether to propylene glycolmonomethyl ether acetate of 1:1 to obtain 6% by mass of a composition.The resultant composition is applied onto an organic underlayer film,and the developability of the composition is evaluated, in which acomparison of exposure amounts at the time when curing starts is made.The comparison result is as follows.

TABLE 7 Composition Composition Composition Composition prepared fromprepared from prepared from prepared from Synthesis Synthesis SynthesisSynthesis Example 1 Example 2 Example 3 Example 9 Exposure 1 mJ 6 mJ 3mJ 12 mJ Amount at the time when curing starts

It is revealed that polysiloxanes having unit structures having phenolichydroxy groups derived from Formula (5-1), Formula (5-2), and Formula(5-3), respectively, are cured at smaller amounts of exposure.

In the present invention, a phenoplast crosslinking reactive unit ofFormula (1) reacts also with a phenolic compound of Formula (1-2) and analiphatic alcohol of Formula (2-2). The composition of Example 25 wassubjected to “measurements of exposure sensitivity”, and as a result,the composition was cured at 8 mJ. That is, as a crosslinking partner,more preferable is a combination with a unit having a hydroxy group,irrespective of whether the unit is aromatic or aliphatic.

INDUSTRIAL APPLICABILITY

The radiation sensitive composition including a siloxane polymerexhibiting phenoplast crosslinking reactivity as a base resin isexcellent in resolution and can be used as a radiation sensitivecomposition capable of allowing a pattern having a desired-shape to beformed with sufficient precision.

1. A compound of Formula (5-1) or Formula (5-3):

wherein R¹⁷ and R²¹ are each an ethyl group; R²² and R²³ are each amethyl group; and R¹⁶ and R²⁰ are each a methoxy group.
 2. The compoundof claim 1, wherein the compound is a compound of Formula (5-1).
 3. Thecompound of claim 1, wherein the compound is a compound of Formula(5-3).